Mercury is a Special Agent for the CPD, working as a mechanical engineer. He is a rookie, having only worked in the detective division for a few months. He likes to have an open heart, but knows sometimes that it's best to choose when that can be applied.

Mercury grew up in a formal academic life, but soon shed that once the war began affecting his home. By the time he was old enough to join the UNSC, the war was over, so he turned to work at the CPD. He's heard of people like Ned West working with them, inspiring him in himself that he'd meet other war legends in his time there.