The problem lies in the magogenetics - you might have a shifter-human cross via genetic tampering, but doing this means there is no in-canon way at all to be able to guarantee a) which biology takes precedence, b) whether the creature born is sentient, and/or c) whether or not it can shapeshift - much less possess, due to the genetic blenderizing, any other of the shifter abilities. Chimera tinkerers can generate llama-cats with glowing alpaca fur all day long, but that's all still 'standard' genetics - bioluminescence and whatnot. It's the magic side what'll screw you over every time, simply because humanity doesn't understand what triggers, how it triggers, or (and this is still important in genetics) when it triggers - or turns off.
And while Chimera might be a good runner name, well ... I wouldn't get caught with it within 2000 miles of Seattle. A certain group of ex-KGB kick-artists might take offense.