Zookeeper.

About Zookeeper

Zookeeper is a character appearing in American comic books published by DC Comics. He is primarily as an enemy of the Teen Titans. Zookeeper is tied to the backstory of Titans member Beast Boy, having worked with his parents when Beast Boy was a child. Zookeeper gained the ability to transform into animals, similar to Beast Boy, after infecting himself with the virus that gave Beast Boy his powers.