Captain Viridian is the captain of the D.S.S. Souleye. He is also the main character of the game VVVVVV, in which the player controls him. His most prominent ability is flipping gravity, which helps him traverse what would be impossible for regular human beings. He appears as a cyan stickman. At most times he is highly optimistic, but in some cutscenes and dialogue, he does doubt his ability to help his crew members.

In VVVVVV, when the D.S.S. Souleye was trapped in Dimension VVVVVV after hitting the "Ninstar Elevator Defense", Viridian and the five members of his crew were all seperated and teleported to seemingly random places in the dimension. Viridian then embarked on a perilous journey through the dimension to rescue his crew and find his ship.

He is the singer at the end of the game.