Batgirl is a vigilante.
Batgirl observed Batman and his allies launch their chase and fired her own grappling gun to join the Bat family in pursuit of The Penguin.
- Batgirl first appeared in Batman #139 created by Bill Finger and Sheldon Moldoff. The design of Batgirl featured in Batman: Bad Blood first appeared in Batgirl #35 created by Cameron Stewart and Babs Tarr.
- Batgirl's grapple gun appears to be a modified handgun or pistol, suggesting some technical expertise, while she is only seen swinging from the line and not being pulled towards a target like Batman or Robin.