Zienko is an elite soldier and a member of the Murder of Crows, a team composed of Jacob Kane's old partners in the special forces. He is a demolitions expert, pilot and marksman of Ukrainian origin. In his youth, he was a cage-fighting champion. He trained Batwoman and Hawkfire along with the rest of the Murder.
Jackson Lloyd was created by J.H. Williams III and Haden Blackman in Batwoman #0.