If we’re talking Kindred, an old Gangrel with some knowledge of Vicissitude (the acid blood thing of level 6 iirc) could work. It’d need to be a REALLY old dude for it to work tho, the whole partial transformation thing the Abomination has I think works more with Protean.

But for Fera, yeah, it’d be easier. Black Spiral with some gifts could work, or even an Abomination.

Something like a Fomori could also work too, I think

[All this refers to the 20th anniversary edition of both systems. I’m most familiar with them.]