I'd go with Vitaly.

Prove chin, Murderous power, 0-100mph temper

I can image it.

"hey Vitaly, he just said fuck you and your brother"

"what? are you sure?"

"yes i heard it loud and clear"

(vitaly hands me his books he just rented from the local library)

"GRR IM GONNA RIP THEIR HEADS OFF!"

(Boom, Ahhh my legs!..ahh help! no no please no not my...AHHH!)

Vitality!