Cyan is an cyan colored square, being one of the Guardians of the Artifact, and so of Cube, which causes him to take too much of himself, and think he's not good enough. due to almost losing both the Artifact and Cube, as well as the other Guardians, he's grown a bit paranoid, and won't trust anyone so easily, but he'd try to trust you. however, he truly cares for those who he's friends with, and who's even closer to him. he tries to be polite to almost everyone he meets, though.