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Compiled 3E Monster List by Type/Subtype

by Robert Blezard

Some of you might be wondering why I've been so eager to figure out which existing 3E monsters and races are appropriate to Mystara. The discussions I've created were meant not only to get ideas flowing, but also to help me compile a proper list of canonical creatures for use with a D&D 3rd Edition game. The process will be ongoing and I'm not sure how much time I'll be devoting to it.

What I have decided is that not only do I want a canonical list, but also semi-canonical and fanon lists. My main sources, for now, will be Monster Manual v.3.5, Monster Manual II (3.0), Monster Manual III (3.5), and Fiend Folio (3.0/3.5*). As the project goes on, I'll be going through the other v.3.5 books with monsters in them.
* While FF isn't a true v.3.5 book, a lot of its stats follow the v.3.5 format.

MM v.3.5 Aberrations
MM v.3.5 Animals
MM v.3.5/PHB v.3.5 Humanoids and Monstrous Humanoids
MM v.3.5 Constructs, Dragons, Elementals, Fey, and Giants
MM v.3.5 Magical Beasts
MM v.3.5 Oozes, Plants, and Vermin
MM v.3.5 Lycanthropes, Outsiders, Undead, and Other Template
Monster Manual II
Monster Manual III
Monster Manual IV
Tome of Horrors (3.0)
Fiend Folio

I'm going to go through each type and subtype one by one, book by book. First up are the aberrations from MM v.3.5. The work-in-progress categories I've placed each creature in is based off the discussions I've already had here on The Piazza. I might not have caught every suggestion so remind me if I've missed something.

MM v.3.5 Aberrations

MM Aberrations w/BECMI Stats
Athach [RC]
Beholder [RC]
Carrion Crawler [RC]
Choker [DMR2]
Mimic (Polymar) [DMR2]
Phasm [CO]
Rust Monster [RC]
Umber Hulk (Hulker) [DMR2]
Will-o'-Wisp (Wychglow) [DMR2]

Semi-Canonical
Beholder, Gauth
Chuul
Ettercap [PWA3] > says these are found in the forests of Esterhold. IMC a few live on the Isle of Dawn and associate with Aranea but not other sentient races.
Otyugh
Umber Hulk, Truly Horrid (Horrid Hulker)

Dimension of Nightmares
Cloaker
Gibbering Mouther
Mind Flayer
Mind Flayer Sorcerer (9th-Level)

Fanon Ideas ?
Aboleth (Hresha-rhak)
Aboleth Mage, 10th-Level Wizard (Hresha-rhak Scion)
Ethereal Filcher (on the Ethereal Plane)
Grick
Nagas
Guardian
Spirit
Water

N/A
Delver
Destrachan
Drider
Naga, Dark
Skum

MM v.3.5 Animals

MM v.3.5 Animals w/BECMI Stats
Bat (Normal Bat) [RC]
Bat, Dire (Giant Bat) [RC]
Bear, Black [RC]
Bear, Brown (Grizzly Bear) [RC]
Bear, Polar [RC]
Boar [RC]
Boar, Dire (Great Boar) [RC]
Cat [GAZ12]
Camel [RC]
Cheetah [DMR2]
Crocodile (Normal Crocodile) [RC]
Crocodile, Giant [RC]
Constrictor Snake (Normal Snake) [GAZ12]
Constrictor Snake, Giant (Anaconda) [CoM]
Dinosaur, Elasmosaurus [BM]
Dinosaur, Triceratops [RC]
Dinosaur, Tyrannosaurus [RC]
Dog (Normal Dog) [DMR2]
Dog, Riding [DMR2]
Eagle (Normal Eagle) [DMR2]
Elephant [RC]
Hawk (Normal Hawk) [DMR2]
Horse, Light (Riding Horse) [RC]
Leopard (Mountain Lion) [RC]
Lion [RC]
Manta Ray [RC]
Monkey [GAZ12]
Mule [RC]
Octopus, Giant [DMR2]
Pony [RC]
Porpoise (Dolphin) [RC]
Rat (Normal Rat) [RC]
Rat, Dire (Giant Rat) [RC]
Raven (Normal Raven & Crow) [DMR2]
Rhinoceros (Normal Rhinoceros) [DMR2]
Roc [RC]
Shark: Medium, Large, and Huge (Bull, Mako, and Great White) [RC]
Shark, Dire (Giant Shark) [BM]
Squid, Giant [DMR2]
Tiger [RC]
Toad [RC]
Warhorse, Light (War Horse) [RC]
Weasel, Dire (Giant Weasel) [RC]
Whale, Baleen [CO]
Whale, Cachalot (Sperm Whale) [RC]
Whale, Orca [RC]
Wolf [RC]

Consolidated Creature Conversion index (Semi-Canonical)
Ape
Ape, Dire (White Ape) ?
Baboon
Badger
Badger, Dire
Bear, Dire
Bison
Dinosaur, Deinonychus
Dinosaur, Megaraptor
Donkey
Horse, Heavy
Hyena
Lion, Dire
Lizard
Lizard, Monitor
Octopus
Owl
Pony, War
Squid
Tiger, Dire
Viper Snake: Tiny, Small, Medium, Large, and Huge
Warhorse, Heavy
Weasel
Wolf, Dire
Wolverine
Wolverine, Dire

Fanon Ideas ?
Swarm, Bat
Swarm, Rat

MM v.3.5/PHB v.3.5 Humanoids and Monstrous Humanoids

Humanoids
MM/PHB Humanoids w/BECMI Stats
Bugbear [RC] *
Dwarf [PHB] [RC] *
Elf [PHB] (Canolbarth/Alfheim) [RC] *
Aquatic Elf [PC3]
Gnoll [RC] *
Gnome [PHB] [RC] *
Gnome, Forest [DRAGON 237] **
Should forest gnomes be Shargughs?
Goblin [RC] *
Halfling [PHB] [RC] *
Hobgoblin [RC] *
Human [PHB only] [RC, as Normal Human]
Kobold [RC] *
Lizardfolk (Lizard Man) [RC] *
Locathah [BM]
Merfolk (Merrow) [RC, as Merman] *
Orc [RC] * (in Darokin)
Half-Orc [PHB]
Troglodyte [RC] *

Semi-Canonical
Dwarf, Mountain (Rockhome / Thyatian Denwarf-Hurgon)
Elf, Gray or Wood (Shiye-Lawr of Alphatia ?)
Elf, Wild (Vulcania elves ?)
Githyanki (mentioned in the AD&D 2E Mystara MC)
Gnome, Svirfneblin (surviving descendants of gnomes in Falun Caverns in Soderfjord ?)
Half-Elf [PHB] (in Kingdom of Eusdria) (lots of reading to do)
Halfling, Tallfellow (at the height of the Kingdom of Blackmoor ?)

Fanon Idea ?
Githzerai

N/A
Dwarf, Deep
Dwarf, Duergar
Elf, Drow
Halfling, Deep

Monstrous Humanoids
MM v.3.5 Monstrous Humanoids w/BECMI Stats
Centaur [RC] *
Doppelganger [RC] *
Gargoyle [RC] *
Hags (Crones of Chaos) [RC] *
Annis
Green Hag
Sea Hag
Harpy [RC] *
Medusa [RC] *
Minotaur [RC] *
Sahuagin (Sar-Aigu) *
Shark-Kin

Semi-Canonical
Derro (Modrigswerg ?)
Harpy Archer, 7th-Level Fighter
Kopoacinth (gargoyle w/Aquatic subtype) > An aquatic form of gargoyle, the Kopoacinth is not a canon Mystaran monster, nor it is known to have been used in unofficial Mystaran material. However, being a construct (in AD&D 2E -RPB) it poses little problems, as there are several Sea People spellcasters who could create constructs of this kind.

N/A
Grimlock
Kuo-toa
Yuan-ti
Pureblood
Halfblood
Abomination

* Canon creature from ripvanwormer's list.
** An AD&D 2E MYSTARA article written by Bruce Heard.

MM v.3.5 Constructs, Dragons, Elementals, Fey, and Giants

Monster Manual v.3.5
Constructs
MM v.3.5 Constructs w/BECMI Stats
Homunculus [DMR2] *

Semi-Canonical
Golems *
Clay Golem
Flesh Golem
Iron Golem
Stone Golem

N/A
Animated Objects (all)
Inevitables
Kolyarut
Marut
Zelekhut
Retriever
Shield Guardian

Dragons
MM v.3.5 Dragons w/BECMI Stats
Dragons, Chromatic *
Black Dragon [RC]
Blue Dragon [RC]
Green Dragon [RC]
Red Dragon [RC]
White Dragon [RC]
Dragons, Metallic *
Gold Dragon [RC]
Dragon Turtle [RC] *
Wyvern [RC] *

Semi-Canonical ?
Dragons, Metallic *
Brass Dragon
Bronze Dragon
Copper Dragon
Silver Dragon

N/A
Pseudodragon

Elementals
MM v.3.5 Elementals w/BECMI Stats
Elementals *
Air Elemental (all) [RC]
Earth Elemental (all) [RC]
Fire Elemental (all) [RC]
Water Elemental (all) [RC]
Invisble Stalker (Sshai) [RC] *

N/A
Belker
Magmin
Thoqqua

Fey
MM v.3.5 Fey w/BECMI Stats
Dryad [RC] *
Nixie [PC3] *
Nymph [BM]
Pixie [RC] *
Satyr (Faun) (PC1) *

N/A
Grig

Giants
MM v.3.5 Fey w/BECMI Stats
Giants
Cloud Giant [RC] *
Fire Giant [RC] *
Frost Giant [RC] *
Hill Giant [RC] *
Stone Giant [RC] *
Storm Giant [RC] *
Ogre [RC] *
Troll [RC] *

Semi-Canonical
Frost Giant Jarl
Ogre Mage *
Troll, Scrag ?

N/A
Ettin
Merrow (ogres with the Aquatic subtype)

* Canon creature from ripvanwormer's list.

MM v.3.5 Magical Beasts

Magical Beasts
MM v.3.5 Magical Beasts w/BECMI Stats
Aranea [CoM] *
Basilisk [RC] *
Blink Dog [RC] *
Chimera [RC] *
Cockatrice [RC] *
Displacer Beast [RC] *
Dragonne [DMR2]
Eagle, Giant (Hiak) [DMR2/HW] *
Gorgon [RC] *
Griffon [RC] *
Hippogriff [RC] *
Hydra, Standard [RC] (also listed as a monster of Entrem in WotI)
Kraken [DMR2] *
Lamia (Lamara) [DMR2] *
Manticore [RC] *
Owl, Giant [DMR2] *
Owlbear [RC] *
Pegasus [RC] *
Phase Spider (Planar Spider) [RC] *
Purple Worm [RC]
Roper [DMR2] *
Sphinxes *
Androsphinx [RC]
Gynosphinx [RC]
Stirge [RC] *
Unicorn [RC] *
Winter Wolf (Ice Wolf) [DMR2/HW] *

Semi-Canonical
Girallon (in the AD&D module I11Needle, which isn't necessarily set in Mystara but which does have planar spiders [of Chak] in it) *
Lammasu (on the Savage Coast) *
Worg [CCCI]

N/A
Ankheg
Behir
Bulette
Darkmantle
Digester
Dire Rat, Fiendish
Ethereal Marauder
Frost Worm
Gray Render
Hydras
Cryohydra
Pyrohydra
Krenshar
Remorhaz
Shocker Lizard
Sea Cat
Sphinx, Criosphinx
Spider Eater
Swarm, Hellwasp
Tarraque
Yrthak

* Canon creature from ripvanwormer's list.

MM v.3.5 Oozes, Plants, and Vermin

Oozes *
MM v.3.5 Oozes w/BECMI Stats
Black Pudding [RC]
Gelatinous Cube [RC]
Ochre Jelly [RC]
Ooze, Gray [RC]

Plants
MM v.3.5 Plants w/BECMI Stats
Assassin Vine (Strangle Vine) [DMR2/CoM] *
Shrieker [RC]
Treant [RC] *

N/A
Phantom Fungus
Shambling Mound
Tendriculos
Violet Fungus

Vermin
MM v.3.5 Vermin w/BECMI Stats
Centipedes, Monstrous (Giant Centipede) [RC]
Insects, Giant
Ant, Giant (all) [RC]
Bee, Giant [RC]
Fire Beetle, Giant [RC]
Scorpions, Monstrous (Giant Scorpion) [RC]

Semi-Canonical
Insects, Giant
Bombardier Beetle, Giant [CCCI]
Praying Mantis, Giant [CCCI]
Wasp, Giant [CCCI]
Insect Swarm [RC, as Insect Swarm only]
Centipede
Locust
Spider
Spiders, Monstrous [CCCI]

* Canon creature from ripvanwormer's list.

MM v.3.5 Lycanthropes, Outsiders, Undead, and Other Template

Lycanthropes
MM v.3.5 Lycanthropes w/BECMI Stats
Werebear [RC]
Wereboar [RC]
Wererat [RC]
Weretiger [RC]
Werewolf [RC]

Semi-Canonical
Wereboar, Dire
Werewolf Lord

Outsiders
MM v.3.5 Outsiders w/BECMI Stats
Demons
Balor (Roaring Demon) [WotI] *
Glabrezu (Howling Demon) [WotI] *
Hezrou (Croaking Demon) [WotI] *
Marilith (Hissing Demon) [WotI] *
Nalfeshnee (Groaning Demon) [WotI] *
Succubus (Whispering Demon) [WotI] *
Vrock (Screaming Demon) [WotI] *
Couatl (Feathered Serpent) [HWR1]
Genies *
Djinni [RC]
Efreeti [RC]
Devil, Imp [GAZ3] *
Rakshasa (Randara) [DMR2] *
Salamander, Average (Flame Salamander) [RC] *
Titan [WotI] *
Triton [DMR2/PC3] *
Yeth Hound (Yowler) [DMR2] *

Dimension of Nightmares
Night Hag (Black Hag [Night]) [RC]
Nightmare [DMR2] *

Semi-Canonical
Archons [RC] *
Hound Archon **
Hound Archon Hero, 11th-Level Paladin **
Genie, Janni ?
Hell Hound *
Salamanders
Flamebrother
Noble

Fanon Ideas
Chaos Beast (possible denizen of Limbo)
Demon, Quasit (similar to Imp)
Devils
Erinyes (similar to Succubus)
Hellcat (alternative to Hell Hound)
Mephits (similar to Imp)
Air Mephit
Dust Mephit
Earth Mephit
Fire Mephit
Ice Mephit
Ooze Mephit
Salt Mephit
Water Mephit
Planetouched
Aasimar
Tiefling
Shadow Mastiff (from the Plane of Shadow, aka Umbral)

N/A
Achaierai
Angels
Astral Deva
Planetar
Solar
Arrowhawks (all)
Azer
Barghest
Demons
Babau
Bebilith
Dretch
Devils
Barbed Devil
Bearded Devil
Bone Devil
Chain Devil
Horned Devil
Ice Devil
Lemure
Pit Fiend
Eladrins
Bralani
Ghaele
Formians (all)
Guardinals
Avoral
Leonal
Howler
Lillend
Ravid
Slaadi (all)
Tojanidas
Vargouille
Xill
Xorn

Undead
MM v.3.5 Undead w/BECMI Stats
Ghoul [RC] *
Lich (Template) [RC]
Mummy [RC] *
Nightshades *
Nightcrawler [RC]
Nightwalker [RC]
Nightwing [RC]
Skeleton (Template) [RC] *
Spectre [RC] *
Vampire (Template) [RC] *
Wight [RC] *
Wraith [RC] *
Zombie [Template] [RC] *

Dimension of Nightmares
Shadow (not considered undead) [RC] * (either from the Nightmare Dimension or the Plane of Shadow [Umbral])

Semi-Canonical
Bodak (Dusker) [M5] *
Ghost [Template] [CCCI]
Ghoul, Ghast [CCCI]
Mummy Lord, 10th-Level Cleric

Dimension of Nightmares
Shadow, Greater (not considered undead | either from Limbo or the Plane of Shadow [Umbral])

N/A
Allip
Devourer
Mohrg
Vampire Spawn

Other Templates ?
Celestial Creature
Fiendish Creature
Half-Celestial
Half-Dragon
Half-Fiend

* Canon creature from ripvanwormer's list.
** Hound archons are very different than the Archone of Mystara.

Monster Manual II

Aberrations
MM2 Aberrations w/BECMI Stats
Catoblepas (Nekrozon) [RC] *
Hook Horror (Hook Beast) [DMR2] *
Ixitxachitls (Devilfish) [RC] *
Ixitxachitl, Average
Ixitxachitl, Vampiric

Semi-Canonical
Dimension of Nightmares
Fihyrs *
Fihyr
Fihyr, Great
Moonbeast
Wyste

Fanon Ideas ?
Avolakia (there is one of these creatures used in the Age of Worms Adventure Path, which Havard has built into a possible future timeline)
Meenlock (Escape from Meenlock Prison [placed Dissident Estate in the light forest south of the trail to Fort Nell])
Morkoth [BM] (also referred to as Morlock on the CCCI)
Undead creature (a Mesmer?)
Neogis (updated to v.3.5 in Lords of Madness) (Mystaraspace)
Adult Neogi
Spawn

Dimension of Nightmares
Grell (as part of an adaption of The Night Below)

N/A (anything else from this list that could be made semi-canonical or fanon?)
Darktentacles
Julajimus
Psurlons (updated to v.3.5 in Lords of Madness)
Psurlon, Average
Psurlon, Elder
Psurlon, Giant
Windghost

Animals/Beasts
MM2 Animals/Beasts w/BECMI Stats
Dinosaurs *
Allosaurus [DMR2/HW]
Ankylosaurus [DMR2/HW]
Dire Animals
Dire Elk (Giant Elk) [X1/DMR2] *
Dire Hawk (Giant Hawk) [DMR2]
Dire Snake (Giant Boa) [CoM]
Dire Toad (Giant Toad) [RC]

Semi-Canonical
Dinosaurs *
Cryptoclidus
Quetzalcoatlus
Seismosaurus
Spinosaurus
Dire Animals
Dire Elephant
Dire Horse
Legendary Animals (one step above dire animals or unique creatures)
Legendary Ape
Legendary Bear
Legendary Eagle
Legendary Horse
Legendary Shark
Legendary Snake
Legendary Tiger
Legendary Wolf (Fenris) ?

Fanon Ideas
Bats, Desmodu
Guard Bat
Hunting Bat
War Bat
Mastodon, Grizzly (could be used in the Hollow World)
Megalodon (prehistoric shark for the Hollow World?)
Sloth, Forest (Vulcanian Sloth) [DR161]

N/A
Boar, Razor
Rampager

Constructs
MM2 Constructs w/BECMI Stats
Golems
Stained-Glass Golem (Glassine Horror) [SCMC] *
Dragonflesh Golem (Drolem) [RC] *
Juggernaut (Hulean Juggernaut) [DMR2/SCMC] *
Nimblewright (Clockwork Swordsman) [SCMC] *

Semi-Canonical
Automations *
Pulverizer
Hammerer
Bogun (Bogan) [MMC] ?

Fanon Ideas ?
Bronze Serpent (useful guardian for an Immortal temple with a snake theme)
Clockwork Horrors (linked to The Beagle [4E])
Adamantine Horror
Electrum Horror
Gold Horror
Platinum Horror
Dread Guard
Golem, Brass (Bronze Golem)
Raggamoffyn
Tatterdemanimal (could be used as a 2-dimensional threat in the Astral Plane)

N/A (anything else from this list that could be made semi-canonical or fanon?)
Captured One
Chain Golem
Half-Golem [Template]
Raggamoffyns
Guttersnipe
Raggamoffyn, Common
Shrapnyl
Rogue Eidolon
Runic Guardian

Dragons
MM2 Dragons w/BECMI Stats
Gem Dragons *
Crystal Dragon [RC]
Emerald Dragon (Jade Dragon) [RC]
Sapphire Dragon [RC]

Semi-Canonical
Gem Dragons *
Amethyst Dragon
Topaz Dragon

Fanon Ideas
Linnorms (useful for the Northern Reaches?)
Corpse Tearer
Dread Linnorm
Gray Linnorm

N/A
Felldrakes (is there anything like the feldrakes in Mystara?)
Crested Felldrake
Spitting Felldrake
Horned Felldrake
Hellfire Wyrm

Elementals
MM2 Elementals w/BECMI Stats
Weird, Water [DMR2] *

Semi-Canonical
Galeb Duhr [PWA3] > says these talking boulders are found in Soderfjord; my guess is there should be a few around the general area, such as in Norwold, Dunadale, Heldann, etc. They could possibly be related to Rock Men (qv); at any rate they are intelligent and communicative but have no particular civilisation.
Related to Rock Men [DMR2/MMC], perhaps?

Fanon Ideas ?
Elemental Weirds
Air Weird
Earth Weird
Fire Weird
Fire Bat (found this link on VoP that puts Fire Bats on the Isle of Dread, as part of the Savage Tide AP [3E])

N/A (anything else from this list that could be made semi-canonical or fanon?)
Breathdrinker
Immoth
Stone Spike
Tempest

Fey
MM2 Fey w/BECMI Stats
Spirit of the Land (Nature Spirit) [GAZ12] *

Fanon Ideas ?
Jermlaine (related to gremlins)
Sirine (part of the Merrow Empire)

N/A
Ocean Strider

Giants
MM2 Giants w/BECMI Stats
Giants
Mountain Giant [RC] *
Ocean Giant (Sea Giant) [RC/PC3] *

Fanon Ideas ?
Firbolg
Formorian
Giant, Forest (in Minaea)

N/A
Giant, Sun

Magical Beasts
MM2 Magical Beasts w/BECMI Stats
Frost Salamander [RC] *
Phoenix [RC] *

Semi-Canonical
Cloud Ray (Forest Ray) [SCMC] ?
Leviathan (is a colossal whale, but still could be used as the Marine Leviathan) [DMR2] *

Dimension of Nightmares
Mooncalf

Fanon Ideas ?
Chaos Roc (possible Denizen of Limbo?)
Chimeric Creature [Template] (since standard chimeras exist in Mystara)
Phase Wasp (mutated form of Giant Wasp?)
Swamplight Lynx (mutated form of Lynx?)

Dimension of Nightmares
Nightmare Beast

N/A (anything else from this list that could be made semi-canonical or fanon?)
Ash Rat
Asperi
Blood Ape
Cloaked Ape
Corollax
Fiendwurm
Gambol
Gravorg
Grimalkin (Shapechanger subtype)
Moonrat
Mudmaw
Nethersight Mastiff
Shadow Spider
Spellguant

Monstrous Humanoids
MM2 Monstrous Humanoids w/BECMI Stats
Kopru [DMR2/PC3] *
Loxo (Pachydermion) [DMR2] *
Ormyrr (Wurmling) [SCMC] *
Scorpionfolk (Manscorpion) [RC] *

Semi-Canonical
Ethereal Doppelganger (Shapechanger subtype) ?
Thri-kreen *

Fanon Ideas ?
Abeils [Beefolk] (all)
Desmodu [Batfolk]
Tauric Creature [Template]
Yak Folk

N/A
Boggle
Braxat
Spell Weaver ?

Oozes
N/A (anything from this list that could be made semi-canonical or fanon?)
Bone Ooze
Flesh Jelly
Reason Stealer
Teratomorph

Outsiders
Fanon ?
Dune Stalker (in the Sind Desert)
Marrash (evil being that looks like a winged gnoll)
Monster of Legend [Template] (could be useful)
Planetouched, Zenythri (descended from powerful, mysterious beings of law)
Sylph (sprite-like creature)
Yugoloths (denizens of Nightmare) ?
Arcanoloth
Marraenoloth
Yagnoloth

N/A (anything else from this list that could be made semi-canonical or fanon?)
Bladeling
Demons
Abyssal Maw
Abyssal Stalker
Abyssal Ravager
Jarilith
Jovoc
Kelvezu
Palrethee
Zovvut
Devils
Advespa
Amnizu
Malebranche
Ether Scarab
Glimmerskin
Guardinals
Cervidal
Lupinal
Half-Fiend, Durzagon
Planetouched, Chaond (descended from slaadi)
Rukarazyll
Vaporighu

Plants
MM2 Plants w/BECMI Stats
Orcwort (Killer Tree) [X2/DMR2] *

Semi-Canonical
Orcwort, Wortling

Fanon Idea
Myconids (all) (types of Fungoid) ?

N/A (anything else from this list that could be made semi-canonical or fanon?)
Greenvise
Needlefolk
Red Sundew
Twig Blight

Undead
MM2 Undead w/BECMI Stats
Banshee [DMR2/RC]

Semi-Canonical
Famine Spirit (Greater Evil Spirit, maybe) ?

Fanon Idea
Death Knight [Template] (Yuri Molotov - Death Knight)

N/A (anything else from this list that could be made semi-canonical or fanon?)
Bone Naga
Corpse Gatherer
Crimson Death
Deathbringer
Effigy
Gravecrawler
Jahi
Ragewind
Spawn of Kyuss
Spellstitched Creature [Template] ?

Vermin
Semi-Canonical
Megapede (similar to Monstrous Centipede) ?
Neogi, Great Old Master (updated to v.3.5 in Lords of Madness) (Mystaraspace)

N/A
Leechwalker

Other Templates
Fanon Ideas ?
Titanic Creature
Warbeast

* Canon creature from ripvanwormer's list.

Monster Manual III

Aberrations
Semi-Canonical
Odopi (home plane is Carceri)
Odopi, Elder (home plane is Carceri)
Seryulins (mounts for Sar-Aigu)
Seryulin, Standard
Seryulin, Greater
Shrieking Terrors (home plane is Carceri)
Five-Headed Terror
Ten-Headed Terror

Dimension of Nightmares
Lurking Strangler
Roper, Prismatic
Runehound

Fanon Ideas ?
Harpoon Spider
Harpoon Spider, Dread
Otyugh, Lifeleech
Quaraphon
Quaraphon Bully, 5th-Level Barbarian
Susurrus

N/A
Mindshredders
Larva
Warrior
Zenthal
Rot Reavers
Rot Reaver, Standard
Necrothane
Spellwarped Creature [Template]
Spellwarped Ettin (templated creature)
Stonesinger

Animals
Semi-Canonical
Dinosaurs
Battletitan
Bloodstriker
Fleshraker
Swindlespitter
Swarm, Needletooth

Fanon
Mastodon (another animal for the Hollow World?)

N/A
Sea Tiger

Constructs
Semi-Canonical
Golem, Mud Golem [RC]

[Fanon Ideas] ?
Warforged (see here, and here, and here)
Warforged, Standard
Charger
Scout

N/A
Cadaver Collector
Cadaver Collector, Greater
Golems
Alchemical Golem
Gloom Golem
Hangman Golem
Prismatic Golem
Shadesteel Golem
Shadesteel Golem, Greater
Web Golem
Grisgol
Shreadstorm
Slaughterstone Behemoth
Slaughterstone Eviscerator

Dragons
Fanon Ideas ?
Ambush Drake
Dragon Eel (Sea Dragon) ?
Rage Drake
Rage Drake, Fiendish

N/A
Dracotaurs
Dracotaur, Standard
Dracotaur Rager, 4th-Level Barbarian
Ssvaklor
Ssvaklor, Greater

Elementals
Fanon Ideas ?
Elemental, Storm
Omnimental

N/A
Chrall
Cinder Swarm

Fey
MM3 Fey w/BECMI Stats
Petal (Flitterling) [DMR2] *
Redcaps [DMR2/PC1] *
Redcap, Standard
Redcap, Elder

Fanon Ideas
Swarm, Shimmerling
Thorn

N/A
Glaistigs
Glaistig, Standard
Glaistig Mindbender, 5th-Level Sorcerer
Ragewalker
Shredstorm
Splinterwaifs
Splinterwaif, Standard
Splinterwaif Knave

Giants
Fanon Ideas ?
Giants
Death Giant
Sand Giant (for the Sind Desert)
Sand Giant Champion, 5th-level Fighter
Ogres, Skullcrusher (variant of standard ogres)
Skullcrusher Ogre, Standard
Skullcrusher Ogre, Sergeant, 3rd-Level Fighter
Trolls
Forest Troll
Mountain Troll (Giant Troll)

N/A
Geriviar
Giants
Eldritch Giant
Eldritch Giant Confessor, 11th-level Cleric
Trolls
Cave Troll
Crystalline Troll

Humanoids
Fanon Ideas ?
Changeling (Zargosian Changeling)
Changeling, Standard
Changeling Spy, 3rd-Level Rogue
Gnoll, Flind (central Davania)
Kenku (both)
Lizardfolk, Poison Dusk (another type of lizard kin)
Poison Dusk Lizardfolk, Standard
Poison Dusk Lizardfolk, Lieutenant, 4th-Level Ranger
Shifter (for Sind or Glantri)

N/A
Goblins, Forestkith (both)

Magical Beasts
Semi-Canonical
Phoera
Vazalka (cold variant creature)

Fanon Ideas ?
Avalancher (in the Black Mountains or Black Peak Mountains)
Bearhound (hybrid creature akin to the owlbear)
Feral Yowler (akin to the Yowler)
Ironclad Mauler (magically engineered dire bear)
Zezir (another interesting desert creature; maybe for Ylaruam)

N/A
Brood Keepers
Brood Keeper
Larva Swarm
Mivilorns
Mivilorn, Standard
Mivilorn, Elite Demon War Mount

Monstrous Humanoids
MM3 Monstrous Humanoids w/BECMI Stats
Goatfolk (Goatman) [SCMC] *

Semi-Canonical
Phoelarch *
Vazalkyon (cold variant creature)

Fanon Ideas ?
Harssaf (lawful, red-skinned monstrous humanoid that lives in the desert) (Sollux)
Lizardfolk, Blackscale (Gurrash Lizard Kin or Sis'thik)
Protean Scourge (rare evolved form of an Astral Protean)
Protean Scourge Arcanist, 4th-Level Sorcerer
Troll, War (just because I like the idea) ;)
Vermin Lord (servant of Mrikitat)
Witchknives [Athames] (it's a stretch but see here)
Witchknife, Standard
Witchknife Captain, 3rd-Level Rogue

N/A
Armand
Armand, Standard
Armand Warden, 4th-Level Monk
Grimlock, voidmind (templated creature)
Gulgar
Lhosk
Nycters
Nycter, Standard
Nycter Defender of the Cave, 5th-level Druid
Skindancer

Oozes
Semi-Canonical
Conflagration Ooze (Lava Ooze) [RC]

Fanon Ideas ?
Arcane Ooze and Summoning Ooze (lots of places these 2 oozes could arise)
Living Spell [Template] (unique for of lost magic from Alphatia) ?
Chilling Fog
Glitterfire
Living Blasphemy
Sickening Sleep
Snowflake Ooze (a Northern Reaches ooze)

N/A
Conflagration Ooze, Infernal

Outsiders
Semi-Canonical
Rakshasas
Ak'chazar
Naztharune

Fanon Ideas ?
Justicator (a lawful neutral angel)
Lumi (a Mystaraspace denizen)
Lumi, Standard
Lumi Crusader, 2nd-Level Fighter/6th-Level Cleric
Yugoloths (denizens of Nightmare)
Canoloth
Mezzoloth
Nycaloth
Ultroloth

N/A
Demons
Arrow Demon
Sorrowsworn Demon
Astral Stalker
Rejkar
Trilloch
Visilight

Plants
Semi-Canonical
Plague Brush (home plane is Carceri)

Fanon Ideas ?
Topiary Guardians (could be used for Glantri)
Boar
Lion
Triceratops
Night Twist (evil offshoot of treants)
Night Twist, Ancient

N/A
Battlebriars
Battlebriar, Standard
Warbound Impaler
Swarm, Dread Blossom
Wood Woad

Undead
Fanon Ideas ?
Dust Wight
Drowned (for the Sea of Dread)
Plague Spewer (spews the Red Curse)
Salt Mummy
Vasuthant (Spectral Death)
Vasuthant, Horrific

N/A
Boneclaw
Bonedrinker
Bonedrinker, Lesser
Charnel Hound
Deathshrieker
Deathshrieker, Advanced
Grimweird
Necronaut
Swarm, Ephermeral

Vermin
Fanon Ideas ?
Siege Crab
Siege Crab, Greater
Swarm, Swamp Strider

N/A
Chelicera
Knell Beetle
Knell Beetle, Lesser

Other Templates
[Fanon Idea] ?
Woodling (for old Alfheim)
Autumn, 9th-level Woodling Human Druid (templated creature)

N/A
Voidmind Creature

* Canon creature from ripvanwormer's list.

Monster Manual IV

Here's the list for MM4. Since the CCCI doesn't have creatures on it from this book, I'mgoing to assume that list was done before MM4 came out. Anything that I think might be appropriate has been marked with an asterisk (*). Anything that is definitely not appropriate has been note with a n/a in brackets/braces. I'm starting from scratch with this list, so it will see a lot of changes over the next week.

Aberrations
Fanon Ideas ?
Howler Wasp *
Howler Wasp Queen *

N/A
Balhannoth (n/a)

Undecided
Lodestone Marauder
Mageripper Swarm
Zern Arcanovore

Animal and Vermin
MM4 Animal w/BECMI Stats
Sailsnake (Flying Viper Snake) [HW] *

N/A
Monstrous Hunting Spider, Lolth-Touched

Extras
Giant Stag Beetle Vermin Companion
Giant Wasp Mount

Constructs
Fanon Ideas ?
Clockroach *
Clockwork Steeds *
Clockwork Pony
Clockwork Stallion

N/A
Clockwork Mender
Clockwork Mender, Swarm

Undecided
Golem, Fang

Elementals
N/A
Avatars of Elemental Evil (n/a)
Black Rock Triskelion (Earth Avatar)
Cyclonic Ravager (Air Avatar)
Holocaust Disciple (Fire Avatar)
Waterveiled Assassin (Water Avatar)

Undecided
Inferno Spider

Fey
Fanon Ideas ?
Lunar Ravager *
Verdant Prince *

Undecided
Joystealer

Giants
Semi-Canonical
Ogres *
Ogre Scout, 4th-Level Scout
Ogre Tempest, 4th-Level Fighter/2nd-Level Tempest

Fanon Idea ?
Giant, Craa'ghoran (mutated stone giants) *

Undecided
Ogre Guard Thrall (is connected to mind flayers)

Humanoids
Semi-Canonical
Gnolls *
Fiendish Cleric of Yeenoghu, 3rd-Level Cleric
Half-Fiend Gnoll Warlock, 4th-Level Warlock
Slave-Taker, 2nd-Level Ranger
Lizardfolk, Dark Talon Tribe *
Dark Talon Champion (Raging), 3rd-Level Barbarian
Dark Talon Soldier
Dark Talon Shaman, 5th-Level Druid
Dark Talon Wasp Rider
Yarshag, 1st-Level Fighter/5th-Level Druid/4th-Level Vermin Keeper
Orcs *
Half-Orc Infiltrator, 3rd-Level Rogue
Orc Battle Priest, 3rd-Level Cleric
Orc Berserker, 4th-Level Barbarian
Orc Plague Speaker, 5th-Level Cleric
War Howler (Raging), 2nd-Level Barbarian/2nd-Level Bard

N/A
Elves, Drow
Arcane Guard, 2nd-level Fighter/5th-Level Wizard
Dark Sniper, 6th-Level Scout
Drow Priestess, 8th-Level Cleric
Lolth-Touched Drow Ranger, 5th-Level Ranger
Lolth's Sting, 4th-Level Ninja
Githyanki
Gish, 2nd-Level Fighter/5th-Level Evoker
Githyanki Captain, 7th-Level Fighter/2nd-Level Blackguard
Githyanki Soldier, 3rd-Level Fighter

Magical Beasts
Semi-Canonical
Spawn of Tiamat +
Blackspawn Stalker
Bluespawn Ambusher
Bluespawn Burrower
Bluespawn Stormlizard
Greenspawn Leaper
Greenspawn Razorfiend
Redspawn Firebelcher
Whitespawn Iceskidder

Fanon Ideas ?
Skiurid (evil extraplanar squirrel) *
Tomb Spider *
Tomb Spider Broodswarm *

Undecided
Bloodsilk Spider
Quanlos

Monstrous Humanoids
Semi-Canonical
Spawn of Tiamat +
Blackspawn Raider
Blackspawn Exterminator, 6th-Level Ninja
Bluespawn Godslayer
Greenspawn Sneak
Greenspawn Sneak Raid Leader, 2nd-Level Ranger/3rd-Level Scout
Redspawn Arcaniss
Whitespawn Hordling
Whitespawn Hunter
Whitespawn Berserker (Raging), 2nd-Level Barbarian

Fanon Ideas ?
Minotaur, Greathorn *
Nagatha (a personal choice I like that may go against the "feel" of the setting)
Varags *
Varag
Varag Pack Leader

N/A
Yuan-ti
Abomination Cult Leader, 4th-Level Marshal
Halfblood Deceiver, 2nd-Level Barbarian
Pureblood Slayer, 1st-level Rogue/7th-Level Assassin
Yuan-ti Ignan

Undecided
Zern
Zern Blade Thrall

Oozes
Undecided
Bloodfire ooze
Corrupture

Outsiders
Semi-Canonical
Dwarf Ancestor *

Fanon Ideas ?
Archons (maybe)
Justice Archon
Justice Archon Champion, 4th-Level Paladin
Concordant Killer *
Demon, Whisper (maybe)
Windblades (possible denizens of Nightmare) *
Windrazor
Windscythe

N/A
Demons
Bebilith, Lolth-Touched
Deathdrinker
Kastighur
Nashrou
Demonhives
Demonet Swarm
Demonhive Attendant
Demonhive Queen
Yugoloths
Corruptor of Fate
Corruptor of Fate Assassin, 5th-Level Assassin

Undecided
Wrackspawn
Voors
Dreadful Lasher
Voor, Standard

Plants
Fanon Idea ?
Oaken Defender *
Wizened Elder *

Undecided
Briarvex

Undead
Fanon Idea
Necrosis Carnex *
Web Mummy [Template] *
Human Commoner Web Mummy (templated creature)

N/A
Bloodhulks
Bloodhulk Crusher
Bloodhulk Fighter
Bloodhulk Giant

Undecided
Defacer
Plague Walker
Vitreous Drinker

Template
N/A
Lloth-touched Creature

Here's a link to the MM4 art gallery, if you want to see what each of the creatures look like.

Tome of Horrors (3.0)

Aerial Servant [RC] *
Archer Bush [DMR2] *
Baric [B3] *
Beholder, Eye of the Deep [BM] *
Brownie [DMR2/PC1] *
Crab, Giant [RC] *
Gas Spore (Blast Spore) [RC] *
Decapus (Land Decapus) [DMR2] *
Jupiter Blood Sucker [B3] *
Mandragora (Manikin) [GAZ3] *
Soul Eater [DMR2] *
Strangleweed [DMR2] *
Vampire Rose [DMR2/Gaz3] *

Fiend Folio

Aberrations
Semi-Canonical
Half-Illithid [Template] ?
Half-Illithid Lizardfolk (templated creature)

Fanon Ideas ?
Ahuizotl
Ocularon (another Dimension of Nightmares prospect)
Spectral Lurker
Tunnel Terror

N/A
Chwidencha
Darkweaver
Ethergaunts (maybe for the Dimension of Nightmares?)
Black Ethergaunt
Red Ethergaunt
White Ethergaunt
Maulgoth
Phiuhi
Rukanyr
Skybleeder
Slasrath
Swarm, Abyssal Ant
Symbionts, Cerebral (how are psionics handled on Mystara?)
Cerebral Hood
Mind Leech
Psionic Sinew
Yuan-ti Anathema

Animals
FF Animals w/BECMI Stats
Indricothere (Grangeri) [DMR2] (on the Isle of Dread) *
Megatherium [DMR2]
Terror Bird (Axe Beak) (on the Isle of Dread) *

Semi-Canonical
Rhinoceros, Dire (Giant Rhino) ?

Fanon Idea ?
Swarm, Viper

N/A
Fhorge

Constructs
Fanon Ideas ?
Caryatid Column
Golem, Brain (servant of brain collectors?)
Inevitables (during the time of Blackmoor, maybe?)
Quarut
Varakhut
Iron Cobra
Wicker Man (scarecrow-like construct)

N/A
Blackstone Gigant
Golems
Blood Golem of Hextor
Demonflesh Golem
Hellfire Golem
Maug
Necrophidius
Zodar

Dragons
FF Dragon w/BECMI Stats
Sea Drake (Sea Serpent) [DMR2] *

N/A
Sunwyrm

Elemental
N/A
Living Holocaust

Fey
FF Fey w/BECMI Stats
Half-Fey [Template] (Changelings) [HWR3] *

Semi-Canonical
Feytouched (same concept as Half-Fey)
Wendigo [Template] (Nature Spirit, Greater or Lesser) ?

Fanon Ideas ?
Fossergrim
Kelpie
Oread

N/A
Phiuhl
Shadar-kai
Spriggan

Giants
Semi-Canonical
Half-Troll [Template] (in the Broken Lands) *

Fanon Ideas
Fensirs (encountered in the Northern Reaches?)
Fensir
Rakka
Giant, Bog

N/A
Giant, Shadow
Half-Troll Barbazu (templated creature)

Humanoids
Fanon Idea ?
Mongrelfolk (a type of beastman)

N/A
Dark Ones
Dark Creeper
Dark Stalker

Magical Beasts
Semi-Canonical
Shedu (on the Savage Coast) *
Terlen (exists on Carceri [see under Demodands])

Fanon Ideas ?
Abrian (evil extraplanar axe beaks?)
Death Dog (evil two-headed dog)
Flame Snakes
Flame Snake, Greater
Flame Snake, Lesser
Flame Snake, Minor
Jackelwere (are there wolfweres and the like on on Mystara? If so...)
Shadow Asp (tomb guardian)
Spirit of the Air (related to the various Mystaran spirits)
Varrangoins (for the Dimension of Nightmares)
Varrangoin, Arcanist
Varrangoin, Lesser
Varrangoin, Rager

N/A
Blood Hawk
Chronotyryn
Cranium Rat
Disenchanter (very Realmsian critter)
Gathra
Kuldurath
Lucent Worm
Senmurv
Swarm, Cranium Rat (Lesser, Average, and Greater Packs)
Thunder Worm
Ti-khana [Template] (linked to yuan-ti)
Ti-khana Deinonychus (templated creature)

Monstrous Humanoids
Semi-Canonical
Ophidian (Snakemen) ?

Fanon Ideas ?
Jackal Lord (related to lupins and/or hutaakans?)
Sarkriths (could be a new type of lizard kin)
Spelleater
Thane
Yurian (aren't there some sort of crabmen in Mystara?)

N/A
Khaasta
Skulk

Oozes
N/A
Ethereal Ooze (maybe?)
Oozes, Aquatic
Bloodbloater
Flotsam Ooze
Reekmurk

Outsiders
FF Outsider w/BECMI Stats
Maelephant (Malfera) [RC/SCMC] *

Semi-Canonical
Demodands (Carceri exists, as per the Savage Coast MC) *
Farastu
Kelubar
Shator
Imps
Bloodbag Imp
Euphoric Imp
Filth Imp

Fanon Ideas
Bacchae
Canomorph (extraplanar werecreature)
Haraknin (were-hell hound)
Demon, Maurezhi (ghoul-like demon)
Formian, Winged Warrior
Keeper (strange outsider from an unknown plane)
Nerras (come from the Plane of Mirrors)
Kalareem
Sillit
Varoot
Planetouched (need better names for Mystara)
Mechanatrix (clockwork-touched | legacy of Blackmoor)
Shyft (ethereal-touched)
Rilmani (neutral outsiders from the Outlands; I'm stretching here)
Aurumach
Cuprilach
Ferrumach

N/A
Aoa (maybe?)
Droplet
Sphere
Canomorphs (extraplanar werecreatures)
Shadurakul (were-shadow mastiff)
Vultivor (were-vorr [see below])
Demons
Alkilith
Klurichir
Myrmyxicus
Skulvyn
Wastrilith
Devas
Monadic Deva
Movanic Deva
Devils
Paeliryon
Xerfilstyx
Formians
Armadon
Observer
Kaorti
Planetouched
Maeluth (devil-touched dwarves)
Wispling (demon-touched halfling)
Slaad, Mud
Steel Predator
Symbionts (Fiendish)
Fiendish Familiar
Gutworm
Soul Tick
Vorr
Yugoloths
Piscoloth
Skeroloth

Plants
Semi-Canonical
Bloodthorn (exists on Carceri [see under Demodands])

Fanon Ideas
Octopus Tree
Vine Horror

N/A
Ironmaw
Kelp Angler
Sporebat
Yellow Musk Creeper
Yellow Musk Zombie [Template]
Yellow Musk Zombie Orc (templated creature)

Undead
FF Undead w/BECMI Stats
Bhut (but very different on Mystara) [DMR2] *

Semi-Canonical
Symbiont, Ghostly Visage (should this symbiont be semi-canonical due to the Shadow Symbiont?)

Fanon Ideas ?
Abyssal Ghoul
Huecuva [Template]
Swordwraith [Template]

N/A
Crawling Head (maybe?)
Crypt Thing
Demon, Blood Fiend
Hullathoin
Quith-Maren
Ulgurstasta

Vermin
Semi-Canonical
Century Worm (Desert Leviathan) ?

Fanon Ideas ?
Swarms, Locust
Rapture
Swarm, Plague Ant
Swarm, Scarab Beetle

(Basically, they are all types of insect swarms.)

N/A
Bonespear
Swarms, Locust
Bloodfiend
Swarm, Wasp (maybe?)

Prestige Classes
I have no idea
Fiend of Blasphemy
Fiend of Corruption
Fiend of Possession

* Canon creature from ripvanwormer's list.