I roar.
She is extremely reserved with outsiders, but very close to those that she knows. She hates humans and attacks them to kill. Otherwise, she can be hot-headed, but is a brilliant leader and military genius.
Teeth, claws, and sometimes, talons. She also has a knife.
Regina was born in the lab she escaped from. Her parents died not long after her birth. Regina doesn't have a very interesting history before she escapes from the lab.