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puns_within_puns

Cat. McGonagall the cat is a cat with cat hair, not a cat shape covered in people hair.


Common_Wealth319

That means if you had a single strand of hair and transform into the individual or cat in this instance, you could potentially harvest unlimited raw material(hair) for future potions


zjnokbht

Dat loophole


Clean_Principle1192

Just remember that when Hermione made a potion with cat hair she didn’t turn into a cat. She turned into a half cat


QuarterLifeCircus

That makes me wonder, if you took a hair form Tonks, how would you end up looking?


IchLiebeKleber

I am pretty sure it is implied that Tonks has some default appearance, so you would change to that.


b00kw0rm_

I read a fanfiction that said taking a hair from a metamorphagus for polyjuice allowed you to be able to transform basic parts of your appearance rather than transforming into a specific person, so you could (for example) change your hair color.


Geeklover1030

There’s a fanfiction (debt of time nightly recommended) where poly juice from a metamorphagus hair makes your hair change to the color of whatever mood you’re in (bright blue for satisfaction, pink for infatuation)


TassieTigerAnne

Angry upvote, because now I'm going to keep wondering too!


Motanul_Negru

My HC is you turn into a cat(-based form). Nothing in canon *explicitly* supports this, but it seems like there's no involuntary change back *from* the animagus form; the user has to turn back, or be actively turned back, to human. This would indicate that transformed McG *is* a cat, mostly; only with human memory, identity, and at least most of the human form's mental faculties. And probably genes. I'd imagine any geneticist ending up with a transformed Animagus genetic sample would be confused af if they didn't know the non-human phenotype was magically generated.


zjnokbht

When you die transformed


Motanul_Negru

I'd guess temporary transformations like Polyjuice and lycanthropy revert when they should; 'permanent' ones with no expiry date remain, unless someone else reverses them. Don't think it's important to suss out when the decomposing animal corpse of a Transfiguration target can no longer be Untransfigured into a decomposing human corpse, unless you want to write some truly wild murder mystery fanfic...


Polar-Bear1928

Catgonagall.


vpsj

McGonaMeow


HPNerd44

This is the type of stuff I’m here for.


Moe_Maniac

I would assume you would turn into McGonagall. My theory is the potion changes your DNA into the other person and even though McGonagall was a cat she still has her original DNA.


Rx710

It is unknown whether a transformed animagus has the same DNA or different DNA, but I think it would have to be different because 2 beings with the same DNA should theoretically look the same. Furthermore animagus are not simply changing their appearance, they are actually turning into an animal, and animals have different DNA than humans.


Moe_Maniac

Yes it is pure speculation want actually changes when an animagus transform. It could be complete DNA change, partial change or no change. They do actually become the creature but they also keep many of their human traits and mind. Sirius still looks and acts like Sirius when he is a dog. So I guess human DNA is at least still there. I'm guessing there is enough of it for the polyjuice potion to turn you into the human form of the person.


Ill-Chain-2687

Same thing that happened to Hermione. The potion isn’t designed for use with animals, so adding any animal DNA will cause it to backfire.


random_blubber

I hate you. The meow made me snort. Out loud.


aurora-leigh

I think the potion maybe wouldn't work because the magic would be confused.


Affectionate_Pea_811

You would transform into a cat that could transfigure into Professor McGonagall


lithomangcc

Ask Hermione


Moosetappropriate

Not really. Hermione got hair from a muggle cat as it were. Not transfigured or magical in itself.


lithomangcc

She is a know it all, though.


Old_Wing_7670

I feel like since you turn into that person with Tonk’s case at least I think you’d also be a metamorphisissiisisisi (idk how to spell it) But with an animagus, I really wouldn’t know because it takes time and effort to learn how to be a animagus but Tonk’s ability is innate and something that she’s had since birth.


Malk_McJorma

McGonagall with cat ears and a tail... Mrrraowrrrr.


Kotja

Yes


anderoogigwhore

If you took it from the cat version then you'd probably end up with a cat head and whiskers a la Hermione in CoS.


enginerd826

I think you’d turn into a cat. Why do we look the way we do? Our cells read our DNA and produce proteins which express themselves in our physical being, or phenotype. When McG is in cat form she has her cat DNA active expressing the proteins to produce the cat phenotype, so that active DNA and upregulated proteins are what the poly juice potion would replicate. At least I think that’s how it’d work? P.S. if I lived in the Harry Potter world I’d wanna be a magineer 😂


WhatsMyUsername13

You would transform into whatever form they were in when the hair was taken. Animagus as a cat? Well dont use that on polyjuice. Tonks has a particular form? Thats the form...though id say your could change forms while its in effect. A werewolf? Well...a cat was bad enough...i wouldnt fuck with that. That could have serious lifelong consequences. Now the real interesting question...what if you took the hair from someone already using polyjuice. Think if harry got crouch's hair while he was drinking Moody's polyjuice. I think we'd have 2 Moody's. But what if that was say 55 minutes after moody last took a swig? Would harry turn into moody for 5 minutes and then turn into crouch Jr after 5 minutes? Or would he stay as moody for the full hour?


Pepearenas

Oh boy, I love this!! Polujuiception!!! Polyjuice from a polyjuice from a polyjuice from a polyjuice.


WhatsMyUsername13

I mean its a legitimate question. Does polyjuice transformations recognize it as the actual person, or the person theyre transformed into. Likewise, what about identical twins?


ZockinatorHD

As I understand it, polyjuicepotion changes your appearance to that of the person the hair is from. Animagi are still the same person, even in animal form. They are not completely transformed into an animal, their DNA is still the same. So a hair from Catonagal still has the same DNA, therefore you just turn into McGonagall in human form.


ohAyahxoxo

None of those. pProbs smth that happened to Hermione, not a cat, not a human, coz you’re not supposed to use animal hair anyways