Dr. Grace Balin is a female anthropomorphic orca.

Before becoming a criminal & ending up in jail, she was once a dedicated marine biologist working at an aquarium. She was a very charitable person who funded an after-school program for underprivileged youths, as well as volunteering at a shelter for the homeless.

But when the aquarium she worked at closed down, she turned to a life of crime to get funding for the aquarium, and became one of many villains who fought against Batmouse.