Who is Porscha Johnson from Bronx Masquerade and what is their importance?

Porscha Johnson had been the object of bullying for months before she'd finally had enough and beat up the bully. As a result, all the children are afraid of her. Porscha claims to be nonviolent, but the cycle of abuse runs in her family. Her mother had frequently abused her before dying from a drug overdose. Porscha lives with her grandmother.