Callahan

A Mentor
Callahan taught Hazard when he was just a recruit in the field, leading Hazard to become one of the best agents in the force. Contrary to him existing in this universe, he wasn't brought here, due to the previous Callahan dying in the explosion that "hopped" Hazard. It's hard to explain why he exists here.

Muliplayer
Callahan has an average gun, the Galil, he is a very good character in that he can temporarily paralyze opponents with his melee. Callahan has knowledge of the human body so he can stun people.

How Low Can You Go?
Callahan's special allows him to become untouchable with melee attacks and counter them, he takes reduced damage as well. The cooldown is 25 seconds and it lasts 45 seconds.