This should be an interesting list for ideas for GM's...
warhammeronline.wikia.com/wiki/Bestiary
Animals
* Beasts
o Basilisk
o Bear
o Boar
o Giant Bat
o Great Cat
o Hound
o Rhinox
o Wolf
* Birds
o Great Eagle
o Warhawk
o Vulture
* Insects & Arachnids
o Giant Scarab
o Giant Scorpion
o Giant Spider
o Tomb Swarm
* Livestock
o Chicken
o Cow
o Horse
o Sheep
* Reptiles
o Cold One
o Giant Lizard
* Critter
o Bat
o Black Bird
o Crab
o Deer
o Eagle
o Grimmenhagen Sheep
o Hare
o Hen
o Lizard
o Rabbit
o Rat
o Raven
o Seagull
o Sparrow
o Spider
o Warbler
edit Daemons
* Daemons of Khorne
o Bloodbeast
o Bloodletter
o Bloodthirster
o Flesh Hound
o Juggernaut of Khorne
* Daemons of Nurgle
o Great Unclean One
o Nurgling
o Plaguebearer
o Plaguebeast
o Slime Hound
* Daemons of Slaanesh
o Daemonette
o Fiend
o Keeper of Secrets
* Daemons of Tzeentch
o Firewyrm
o Flamer
o Horror
o Lord of Change
o Screamer
o Watcher
* Unmarked Daemons
o Chaos Fury
o Chaos Hound
o Chaos Spawn
o Daemon Prince
o Daemonvine
o Walker
edit Humanoids
* Beastmen
o Bestigor
o Bray Shaman
o Doombull
o Gor
o Ungor
* Dwarfs
o Dwarf
o Engineer
o Hammerer
o Ironbreaker
o Runepriest
o Dwarf, Slayer
o Dwarven, Slayer
* Elves
o Archmage
o Black Guard
o Dark Elves
o Disciple of Khaine
o High Elf
o Shadow Warrior
o Sorceress
o Swordmaster
o White Lion
o Witch Elves
* Greenskins
o Gnoblar
o Goblin
o Night Goblin
o Shaman
o Squig Herder
o Orc
o Black Orc
o Choppa
o Savage Orc
o Snotling
o Squig
* Humans
o Bandit
o Bright Wizard
o Chaos
o Chosen
o Drakk Cultist
o Empire
o Ghoul
o Knight of the Blazing Sun
o Magus
o Marauder
o Plague Victim
o Warrior Priest
o Witch Hunter
o Zealot
* Ogres
o Gorger
o Ogre Bull
o Ogre Tyrant
o Yhetee
* Skaven
o Rat Ogre
o Skaven
edit Monsters
* Chaos Breeds
o Centigor
o Chaos Mutant
o Dragon Ogre
o Flayerkin
o Harpy
o Maggot
o Minotaur
o Tuskgor
* Dragonoids
o Dragon
o Hydra
o Wyvern
* Giants
o Chaos Giant
o Giant
* Magical Beasts
o Cockatrice
o Griffon
o Imp
o Manticore
o Pegasus
o Unicorn
* Trolls
o Chaos Troll
o River Troll
o Stone Troll
o Troll
edit Plants
* Forest Spirits
o Dryad
o Spite
o Tree Kin
o Treeman
edit Undead
* Constructs
o Asp Bone Construct
o Bone Giant
o Living Armor
o Scarab Bone Construct
o Tomb Scorpion
o Ushabti
o Winged Nightmare
* Greater Undead
o Liche
o Preserved Dead
o Vampire
* Skeletons
o Carrion
o Skeletons
* Spirits
o Banshee
o Spirit Host
o Wraith
* Wights
o Wights
* Zombies
o Zombies