Kiefer is a mercenary who is trying to take down a large weapons development company, constantly trying to save his former friend who works as a bodyguard there.

He is sarcastic, and can get pretty serious at times, wanting to do what is right by him, which doesn't always apply to everyone else. Kiefer also has an AI called Zeta, who he uses to hack tech and get him access to anywhere he needs to go.

He used to serve in the UNSC as a scout, alongside his friend Desmond. After Desmond was taken by a person called Buck, Kiefer was sent to a different outpost and soon took down a large terrorist organization, getting the leader arrested. However that has had consequences on Kiefer and it forced him to go AWOL and on the run. He managed to find Buck and Desmond again and now wants to do what he considers right this time: Saving Desmond from Buck, and stopping Buck from unleashing his plan.