When it comes to shapeshifters, usually they can take on whatever from they like as long as they can imagine it, though usually with certain limits like "living beings only" or "non-living beings only". However, not all shapeshifters are made equal, and some of them have heavy limits and need to collect them with some effort.

However, not all form collectors will be listed here, given some of them have a much easier time in collecting forms, such as Rimuru Tempest, Alex Mercer (and James Heller by extension), Beast Boy, and the T-1000. The Spy uses technology for his disguises and can presumably put on different masks outside of the game. Technically, all Cybetronians collect altmodes out of machinery (mainly Earth vehicles), but most always have a default, so they barely have big enough lists to swap from.

That said, there are certain entities in the Pantheon that there can't be more than one of, even with shapeshifting, because something bad will happen as a result. Usually universal catastrophe events. So that means such entities should never be acquired by the listed deities below, if it's even possible for them to in the first place. The biggest example would be Kazuma Kenzaki/Kamen Rider Blade, as he's the (second) Joker Undead and per the rules of the Battle Fight, the world will end if there's more than one Joker in any given place at one time. In the Pantheon, that just means the entire surrounding area is obliterated, which would give the shapeshifter away immediately (or just kill them if they don't know how to use the Joker's power correctly).

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Animorphs

Pre-Pantheon Morph Rosters

Morphs used during Sario Rip events, and those acquired by Tobias before he suffered Shapeshifter Mode Lock are not counted here. Rachel's crocodile morph is also not counted, having been ejected via Hereth Illint. Morphs acquired for the TV Show incarnations are not listed either.

Animorphs Roster

Form	Acquired By	Notes
Homer the Golden Retriever	Jake
Green Anole Lizard	Jake
Siberian Tiger	Jake	Jake's default battle morph.
African Elephant	Rachel, Cassie, Tobias, Ax	This was Rachel's default battle morph before acquiring the grizzly bear.
Red-Tailed Hawk	Tobias	Becomes his new default body.
Horse	Cassie
Big Jim the Silverback Gorilla	Marco	Marco's default battle morph.
Peregrine Falcon	Jake	Jake's default flight morph.
Flea	All
Bald Eagle	Rachel	Rachel's default flight morph. The DNA donor is male.
Shrew	Rachel
Fluffer McKitty the Tomcat	Rachel
Osprey	Cassie, Marco	Cassie and Marco's default flight morph. They acquired from the same osprey.
Wolf	Jake, Rachel, Cassie, Marco	Jake's acquired a male wolf, while the others acquired a female wolf in order to keep to the alpha heirarchy as they had assumed was the case at the time. Cassie's default battle morph.
Trout	Jake, Rachel, Cassie, Marco
Bottlenose Dolphin	All
Seagull	All
Squirrel	All exc. Tobias	Cassie's acquired squirrel is named Magilla.
Tiger Shark	Ax
Human	Ax	Ax's human morph is achieved via the Frolis Maneuver where he melds Jake's, Rachel's, Cassie's, and Marco's DNA into one "strand". He has to acquire Jake's DNA again later on, however.
Black Garden Ant	All exc. Tobias	This morph is what scares off the Animorphs from using eusocial insects whenever possible.
American Lobster	Jake, Marco, Ax
Northern Harrier	Ax	Ax's default flight morph.
Cockroach	All
Housefly	All
Jake the Human	Ax
Great Horned Owl	All exc. Tobias
Grizzly Bear	Rachel	Rachel's default battle morph.
Mouse	Marco, Ax
Humpback Whale	Cassie
Rattlesnake	Ax
Termite	All exc. Tobias
Skunk	All exc. Tobias	The acquired skunk is female. The same animal is used for the morph.
Courtney the White Rat	Rachel, Cassie
Irish Setter	Marco
Wolf Spider	Cassie, Marco, Ax	The same animal is used for the morph.
Brown Bat	All exc. Tobias
Rachel the Human	Cassie
Llama	Marco
Hork-Bajir	All	Rachel, Ax, and Cassie acquire Jara Hamee. Tobias acquires Ket Halpak. Jake and Marco acquire unnamed Hork-Bajir Controllers (the latter having two separate ones), as does Cassie later on (for infiltration since Jara Hamee is known by the enemy).
Raccoon	Tobias, Ax
His Human Self	Tobias
Racehorse	All	Cassie's acquired horse is a male named Minneapolis Max.
Parrot	All exc. Tobias and Ax	Jake's parrot morph is white, Rachel's is yellow-orange, Cassie's is crimson, and Marco's is green.
Hammerhead Shark	All	The same animal is used for the morph.
Rhinoceros	Jake, Marco
Mole	All
Mosquito	All
Caterpillar	Cassie	This morph has metamorphosed into a butterfly. It is not know if the caterpillar morph is still accessible to Cassie or if the butterfly is also/instead available.
Spawn the King Cobra	Marco
Dragonfly	All
Adult Male Human	Jake, Marco
Rabbit	Tobias	The acquired rabbit is female.
Giant Anteater	All exc. Tobias and Ax	Due to having acquired this morph while shrunk, morphing to this animal would make them Kaiju-sized.
Baby Ringed Seal	All
Nanook the Polar Bear	All	Nanook is male.
Howler	Jake
Sperm Whale	Rachel, Tobias
Giant Squid	All
Chimpanzee	All
Bull	Tobias, Ax
Cow	Ax
Eel	All exc. Ax
Illim the Yeerk	Cassie
Mr. Grant the Human	Marco
Mountain Goat	Tobias, Marco, and Ax
Starfish	Rachel	Due to the fact that being split in half also made two separate instances of her, Rachel doesn't intend to use this morph ever again.
Ax the Andalite	Tobias
Euclid the Poodle	Marco
Cockatiel	All exc. Tobias
Swoosh the Orca	All
Nartec Warrior	Tobias
Cheetah	All exc. Jake and Tobias
Pit Viper	Cassie
African Cape Buffalo	Cassie
Honeybee	All exc. Jake
Taxxon	Tobias, Ax
Taylor the Human	Tobias
Kangaroo	Cassie
Various US Military Humans	Rachel, Tobias, Ax
North American Beaver	All
Champ the German Shepherd	Rachel, Tobias, Marco
Mallard Drake	Tobias, Marco, Ax
Female Human Governor	Marco
Human U.S. Army Officers	Rachel, Ax
Anaconda	Jake
Eagle	Marco

Visser Three's Roster

Note: In the Pantheon, Esplin's brainless host and Alloran both have these morphs.

Form	Notes
Antarean Bogg
Unnamed Creature	A giant creature with eight legs, eight arms ending in three-fingered claws, eyes like gold of molten lava, glowing hot fangs, red-hot blood, serpentine necks, and legs thick as trees, and spits fire from its heads.
Vanarx
Three-Legged Rock Beast	The morph is a large creature.
Mardrut	This morph is large and aquatic.
Taxxon	Acquired by Alloran prior to infestation.
Human	It's not known if he disposed of his subject(s), and/or if he used the Frolis Maneuver to make this morph. He has also acquired one Hewlett Aldershot III, one Tony, one Aria, and one National Guard Commanding Officer.
Lebtin Javelin Fish	This morph is average-sized and aquatic. It has broom-length spears on top of its "wings" that it can fire.
Hork-Bajir
Yellow Sea Serpent Creature	The morph is large and aquatic.
Winged Porcupine-like Creature	The morph is large and flight-capable.
Kafit	The morph is flight-capable to the level of other birds. Likely acquired by Alloran prior to infestation.
B'Heeon	This morph is large, with a large sticky pink tongue.
Dule Fansa	The morph is large, purple, has a face where its chest should be. It has big eyes and a mouth full of sharp teeth, and four muscular arms ending in sharp, red points that can be launched at its enemies. The points are connected by accordion-like skin that pulls them back and sets them up to be launched again.
Kaftid	The morph is eight-legged, has a seahorse-like head with leathery wings located on its head, slimy green frog skin, and is able to spit a quick-dissolving acid from its mouth.
Giant Anteater	Due to having acquired this morph while shrunk, morphing to this animal would make him Kaiju-sized.
Eyeball With Tentacle Eyelashes	This morph can shoot out its tentacles to paralyze stricken parts on contact, and it's aquatic.
Chameleon-like Crab creature	This morph is a large creature, can adapt its colors to the environment seamlessly, and is fine above water.
Luminar	This morph is average-sized stout biped, and can shoot intense heat from its fingers, but loses this power if drenched in water. Its smile crackles with electricity.
Giant Squid
Putrid Flesh Creature	This morph is eight feet tall, oozes a foul stench akin to sewers and corpses, is resilient to physical attacks, and is almost like a Blob Monster.
Small Creature	It is not known what kind it is, if it's from an alien planet or from Earth, but Esplin had realized that bigger isn't always better in every circumstance.
Acid Creature	This morph is black and gooey, and its touch is corrosive and smoking. It can shoot short, thick, dripping tentacles from its body, and it has a huge, red mouth with buzzsaw teeth and dripping with acid. These tentacles can shoot acid at anything they point at.
Bievilerd	This morph is aerial, possessing orange eyes, giant wings, and a mouth full of small, razor sharp teeth, along with a silver tongue. Its body is black and almost like a stealth bomber.
Squid-Like Creature	This morph is giant, with a fat body covered with black scales, twenty raw bulging red eyes, and twenty spike-covered tentacles the size of eels. While normally aquatic, it can operate just fine on land.

Tom Berenson's Roster

King Cobra
Golden Eagle
Jaguar

(Insert Name Here)'s Roster

Thanks to the Alternamorphs books, INH is able to access these morphs by default.

Ferret
Giraffe
Hyena
German Shepherd (K-9 Unit named Princie)
Horse
Fly
Hawk
Hork-Bajir
Cockroach
Wolf

Acquired Morphs for Animorphs

In light of all the other various creatures available in the Pantheon, the Animorphs deemed it imperative that they go on another "acquiring trip" just like they had before in the Gardens Cassie's parents worked in. That said, moral quandaries have surfaced when it turned out that some of the ascended creatures were sapient and most were sentient, so that meant asking for permission (or not if they're malicious and hostile).

Form	Donor(s)	Acquired By	Notes
Vulpimancer	Ben Tennyson's Wildmutt Form	All	Test run to see if Ben's transformations can be copied.
Xenomorph	Xenomorph Drone	All	While caution has to be observed while in "Xeno-morph" (as Marco puts it) due to its reputation, heroes eventually deduced that if a Xenomorph is actively avoiding harming anyone and is using thought-speak, it must be an Animorph.
Zubat	Zubat	All
Golbat	Golbat	All
Zoroark	Zoroark	All
Chansey	Chansey	Cassie, Jake, Marco
Audino	Audino	All exc. Rachel and Ax
Indominus Rex	Indominus Rex	All exc. Cassie	After acquiring the I. rex, Jake arranged for a test run on whether her instincts can be controlled, and for Tobias (in Hork-Bajir morph) to kill him if he starts going on an extended rampage. Thankfully, it was suspiciously easy. Tobias theorized that it's because the I. rex is fully sapient and not running entirely on instinct like most dinosaurs.
Jurassic Park Velociraptor	The Raptor Pack	All	Ax acquired them all and merged their DNA via Frolis Maneuver to make a unique morph, then taught everyone else the same technique.
Chocobo	Chocobos	All	The specific chocoholic they acquired was a gold variant owned by Cloud Strife in his adventure, capable of crossing rivers, mountains, and even over oceans. They also acquired all three variants of Ivalician Chocobos for combat diversity.
Alolan Vulpix	Lillie's Snowy	All
Swellow	Ash Ketchum's Swellow	All	An electric-resistant bird can't be found anywhere else aside from Zapdos, and the Legendary Bird is too conspicuous. ^note ((Kilo)Wattrel is currently "out of reach" since there are no ascended Paldeans yet.)
Charizard	Ash Ketchum's Charizard	All exc. Marco and Cassie	Ash's Charizard was chosen over the Pantheon's one because he's a bigger specimen than the average (which stands at 5'07"), whereas he can be comfortably ridden.
Ivysaur	Ash Ketchum's Bulbasaur	Jake, Marco, Cassie	They wanted to see if a Planimal could be acquired, since plants can't be acquired. They all ended up evolving straight to Ivysaur, since Bulbasaur was already primed for evolution, but simply refuses to evolve out of choice.
Buizel	Ash Ketchum's Buizel	All
Corviknight	Hop's Corviknight	All
Duosion	Bede's Duosion	Jake, Cassie, Marco
Lapras	Misty's Lapras	All
Pachirisu	Dawn's Pachirisu	All
Sigilyph	Calem's Sigilyph	All
Alomomola	Serena's Alomomola	All
Blastoise	Blue's Blastoise	Marco
Dragonite	Red's Dragonite	All	Acquired before Dragonite ascended as a deity.
Lanturn	Misty's Lanturn	All
Yanma	Red's Yanma	Jake
Absol	Absol	All
Lucario	Lucario	Cassie, Ax	Lucario entrusted only the following two with his form.
Piglin	The Piglins	All
Inkling	The Inklings	All
Octoling	The Octolings	All
Carnotaurus	Carnotaurus	All exc. Cassie
Jigglypuff	Jigglypuff	Cassie
Meowth	Meowth	Marco, Ax
Machamp	Machamp	Marco, Rachel
Miltank	Miltank	Cassie
Slaking	Slaking	Marco
Shaymin	Shaymin	Cassie
Bewear	Bewear	Rachel	Ended up acquiring her in response to Bewear trying to hug her.
Beautifly	May's Beautifly	Cassie
Rhydon	Rhydon	Jake, Rachel
Mantis	The Mantis	All
Changeling Queen	Queen Chrysalis	All	They caught her pretending to be Ax, but her casual restraint in eating food (which Ax very much struggles to do) busted her and they all (minus Ax, who arrives later) beat her half to death before Rachel and Marco get the idea for everyone to acquire her.
Minael and Yunael	Minael and Yunael	All	Acquired during a prop hunt event orchestrated to give the team a chance to acquire them. Due to the nature of how Land of Magic!Magical Girl transformation works, the Animorphs do not have access to the civilian forms Mina and Yuna Amasato.
Apatosaurus	from Isla Nublar	All
Ankylosaurus	from Isla Nublar	All
Pteranodon	from Isla Sorna	All
Pachycephalosaurus	from Isla Sorna	All
Stegosaurus	from Isla Sorna	All

Ben 10

Ben Tennyson's Original Omnitrix Roster

This list will not include aliens unlocked in the reboot. You can look up the Ben 10 Wiki for each species.

Original Series

Form	Form Name	Notes
Vulpimancer	Wildmutt
Tetramand	Four Arms
Galvan	Grey Matter
Kineceleran	XLR8
Galvanic Mechamorph	Upgrade	Technically speaking, this transformation isn't a complete one.
Petrosapien	Diamondhead
Piscciss Volann	Ripjaws	This transformation in completely aquatic and stuggles to breathe above water.
Lepidopterran	Stinkfly
Ectonurite	Ghostfreak	Zs'Skayr is the "donor" for this form.
Pyronite	Heatblast
Arburian Pelarota	Cannonbolt
Florauna	Wildvine
Loboan	Blitzwolfer
Thep Khufan	Snare-Oh
Transylian	Frankenstrike
Gourmand	Upchuck	Has the Perk and Murk variants of the species, which Ben can switch between.
To'kustar	Way Big
Splixson	Ditto
Opticoid	Eye Guy
Nosedeenian	Buzzshock
Polar Manzardills	Arcticguana
Spheroid	Spitter

Alien Force

Form	Form Name	Notes
Methanosian	Swampfire
Sonorisian	Echo Echo	Not only can he multiply, as long as one instance survives, Ben is safe.
Vauxausaurian	Humongousaur
Aerophibian	Jetray
Necrofriggian	Big Chill	Big Chill is from an asexual species.
Crystalsapien	Chromastone	Sugilite, the donor, is actually a Single Specimen Species.
Cerebrocrustacean	Brainstorm
Arachnichimp	Spidermonkey
Polymorph	Goop
Celestialsapien	Alien X	On top of Ben himself, Alien X has two other personalities, Serena and Bellicus, who would normally render the transformation immobile due to their debates. Eventually however, he manages to convince them to let him take the reins by suggesting that with him in control, he wouldn't ever need to interfere with their debates.
Biosorvotian	Lodestar
Appoplexian	Rath
???	Nanomech	Nanomech was sampled from the Hive, a species of nanomechanical parasite life forms that intended to rule over Earth then. Due to some weird result of the DNA combination, Nanomech retains some human features compared to his natural species' usual state.

Ultimate Alien

Form	Form Name	Notes
Orishan	Water Hazard
Geochelone Aerio	Teraspin
Prypiatosian-B	NRG	Has a Powered Armor because his true form is highly radioactive, but should the need arise, it has a handle on the top to rumble in that form.
Talpaedan	Armodrillo
Amperi	AmpFibian
Citrakayah	Fasttrack
Marlinisapien	Chamalien
Oryctini	Eatle
Chronosapiens	Clockwork
Planchaküle	Jury Rigg
Gimlinopithecus	Shocksquatch

Omniverse

Form	Form Name	Notes
Segmentasapien	Bloxx
Conductoid	Feedback
Galilean	Gravattack
Orthopterran	Crashhopper
???	Ball Weevil
Atrocian	The Worst
Ickthyperambuloid	Walkatrout
???	Mole-Stache
Nemuina	Pesky Dust
???	Kickin Hawk
???	Toepick
Incursean	Bullfrag
Pturbosaurian	Astrodactyl
???	Atomix
???	Gutrot
Vladat	Whampire
???	Ventrilosquid
Vreedle	Decagon Vreedle	Ben doesn't actually know he has this form, and was horrified to find that out whens someone who can see beyond the fourth wall told him.

Ben Tennyson's Allowed Pantheon Transformations

Form	Donor	Form Name	Notes
Hork-Bajir	Tobias	Lizardblade	Scanned from his morph.
Andalite	Ax
Yeerk	Esplin 9466		Scanned after he had been infested by Esplin, who then tried to transform with Ben, only to turn into Upgrade, which doesn't have a central brain and was immediately free.
Flora Colossus	Groot	Green Root	Transformation comes with a translation device so that he won't be confused with the donor Groot.
Gargoyle	Goliath	Bellwood	Timeout function still works even if Ben is currently stone. He chose the name through following the naming convention the Manhattan Clan sans Goliath and Angela used, and Bellwood is where Ben was born in.
Dragon	Spike	Drake	Ben's form's scales are green-and-black like his attire, and his body is the form Spike assumes in the series finale Time Skip.
Pony	Applejack, Starlight Glimmer, and Rainbow Dash		Ben can switch between Earth Pony, Pegasus Pony, and Unicorn Pony forms. His fur is green, his hair is colored the same as his human form, and his cutie mark resembles the Omnitrix symbol.
Ent	Treebeard	Great Oak
Yautja	Scarface
Cybertronian	Optimus Prime		Ben has to scan Alt Forms each time he turns into this, to his annoyance.
Yoshi	Yoshi
Lucario	Lucario	Jackalaura
Piglin	The Piglins
Inkling	The Inklings
Octoling	The Octolings
Kecleon	Kecleon Brothers		Ben considered whether it's possible to ask permission from them, or to just try and scan one while they're rushing him and take the pain.
Asari	Liara T'soni
Na'vi	Neytiri
Namekian	Demon King Piccolo	Super Slugger	Copied during a fight with Master Roshi and Krillin with Piccolo's express permission beforehand. This Namekian form has innate regeneration, sensitive hearing, hardened skin, and limb elongation, but does not have automatic access to more complicated techniques like flight, Ki blasts, or Magic Materialization. Ben would eventually try to learn these himself.

Cassette Beasts

Pre-Pantheon Tapes

While the party recorded many monsters during their adventure, only some of their tapes came with them to the Pantheon.

Player character	Dominoth, Bulletino, Boltam, Diveal, and Jumpkin
Kayleigh	Sirenade
Eugene	Clocksley
Felix	Brushroom
Meredith	Kittelly
Viola	Spirouette
Barkley	Pombom (Ice bootleg)

Tapes recorded in the Pantheon

Form	Donor(s)	Acquired By	Notes
Kuneko	Kuneko	All
Bansheep and Candevil	Followers of the Kanto Starter Pokémon	All
Goblin Hood	Goblin Hood	Eugene	Acquired in the Monster Sanctuary

My Hero Academia

Himiko Toga's Blood Sample Collection

Himiko's Quirk is the ability to transform into a physical lookalike of another individual, as well as copy their voice. She can only transform into people whose blood she has ingested. The more blood she drinks, the longer she has access to that person's form. For example, 1 cup of blood lets her transform for a total of 18 hours. She can switch between the appearances of multiple people if she drinks the blood of more than one person. She can even duplicate a person's clothing, though, her own clothes would overlap the transformation, requiring her to get naked beforehand.

Upon deactivating her Quirk or switching to another disguise, Himiko's disguise melts into a gray viscous liquid.

Himiko's Quirk has since underwent an Awakening, giving her the ability to use the Quirks of the people into whom she's transformed, something that she was previously incapable of doing. Although, Himiko can only use another person's Quirk if she is fascinated by that person and holds that person close to her heart, and she must have sufficient information on their power.

Because of this, Himiko doesn't have a permanent "roster" like everyone else in this database.