Metamorphmagus
From HWWiki
A metamorphmagus is a wizard born with the ability to change their shape at will. the ability is extremely rare and comes only to those who are born with it, unlike that of the animagi that is gained by years of hard work.
Metamorphmagi can make small changes, such as altering the length and colour of their hair, with only a moment's concentration. They are perfectly capable of more drastic ones, such as making themselves appear decades older or giving themselves a near-pig snout. Metamorphmagi presumably cannot take on nonhuman form (though they could presumably make herself look like another humanoid species such as a veela, only without any of the associated abilities), but it has yet to be seen if they can copy the appearance of a specific person. The issue of emulating the opposite gender is an open question and likely to remain that way.
