Cassandra Cain is one of the most efficient sidekicks Batman has ever had, which is But, ultimately, she couldn’t continue as Batgirl in Gotham, so she moved to Hong Kong and took up the identity of Black Bat.
If you don't know oh he is go and watch all of Suicide Silence's older music. RIP Mitch Lucker, a voice as good as the man himself << I dont even listen to this band but I know who he is