Cid the Squid Kid's Links
Mac is a fellow agent, although Cid held some hard feelings towards him at the start because of feeling like Marie replaced them while they were trapped in the Metro. They still sometimes butt heads with him, but they're on better terms now and any resentment Cid still has is transformed into friendly Turf War rivalry. (Unless they're on the same team, but then they just make fun of him if he gets himself splatted doing something stupid like dodgerolling off the stage.)
Fellow agent and friend. They had a slightly rocky start, but they now regularly do Turf Wars together.