The Prompt Cupboard

The Animagus!Harry Collection

Non-magical: Panther, wolf, black cat, mamba, raven, lion, squirrel, chameleon, raccoon, magpie, hawk, kite, kestrel, hognose, boa constrictor, fox, spider, mink, ferret, hummingbird, hyena, roe/hart/muntjac deer, moose, tiger, lynx, flying squirrel, sea krait, crocodile, owl, maned wolf, platypus, seal, horse, bat, moth, mongoose, leopard, rabbit, seahorse, octopus

Magical: Phoenix, Basilisk, nundu, dragon, demiguise, thestral, hippogriff, hydra, thunderbird, occamy, snidget, bowtruckle, augury, firedrake, kneazle, manticore, unicorn, horned serpent, wampus cat, mishipeshu, kelpie, grimm, matagot, kraken

Very specific extra bullshit mary sue: All animals, Shadow/ice/fire version of animal, xenomorph, dementor, daedra, wendigo, Jörmungandr, Fenrisulfr, godzilla, evil unicorn, various pokemon

Extinct bullshit: Dire wolf, titanaboa, thylacine, sabretooth, t-rex

Crack: pygmy puff, squonk, blue the velociraptor, sonic the hedgehog, mothman, the meg, the immortal snail, house elf

And one fic where he could become a hybrid/chimera of any animals magic or not, and was the reason weird mashup cryptids are recorded, because timetravel