well basicly a pretty cool looking chimera with witch ever animal you want or you can have some one that has possessed the power to control the essence of the chimera.

so lets say you make chimera tthe actual beast he would have a certain set of skillz but if you chose to put him as a human form his skillz change
Abilities

Q(beastform): Snake a quick bite that slows enemy with a little poison
Qhumanform): poisonous words would silence enemy/confuse them

W(beastform):Lion Roar powerfull bite that imobalises target for 0.8 seconds while they are traped in your jaw
W(humanform):Lions Courage boost your team mates with lions courage for (ap) as bonus health to your team mates for 5 seconds

E(beastform)Ram: you charge in for the kill dmg bassed attack
E(humanform) your as stuborn as a ram you get normal base movement even if you have boost on and for 5 seconds you cant get stuned/slowed/or airborn but you can still get hit

R(beastform)/(humanform) switch from human to beast form 5 seconds cool down

Ill work on this a little more so you can really share my view of this heros if any one wants to give there opinion im a little new at this !

This seems like it could work.