The description sounds a bit like Half-Animal Mimicry. Or would you make it so that you'd need the animal there/would actually physically merge into the animal?
I think its like comibing an animal with oneself, and therefore you end up with looking like part human, part animal
half animal mimicry, is just the ability to mimic half of an animals physically body. I think with chimerism you absorb the animal and gain half of its dna.
Like merging animals and animal DNA into oneself. It's a bit like a combination of Merging, Animal Mimicry or Half-Animal Mimicry, and a bit of manipulating your own DNA too. Like what C's first character, Sky, did.