Blue

Blue is a Warlock and the central protagonist of Fireteam Weasel.

Project Seraph
Blue is on the Black Garden when he encounters the Taken Guardian, who mysteriously vanishes. He then encounters Skully

Blue woke up on Mars, where his Ghost was on mute as he had drunkenly told it to shut up the night before. He encountered Skully in his attempts to wake his Ghost up.

Personality
Blue is introduced as a self-serving Guardian who doesn't collaborate well with others. He tends to butt heads with authority figures like Ray.