Captain Viridian is the main protagonist of the game VVVVVV.
Captain Viridian is a cyan-colored villi, a blocky, humanoid alien with the ability to flip gravity relative to himself. He is the captain of a ship called the D.S.S. Souleye and a crew of five other villi. While he is usually highly optimistic, he does sometimes doubt his ability to help his crew members when he ventures out to rescue them.
In Super Smash Flash 2
In Super Smash Flash 2, Viridian appears as a background character on Nintendo 3DS when stage hazards are turned on. He appears with his original sprites on the top screen of the Nintendo 3DS during the VVVVVV segment of the stage, in which he acts as a visual indicator for when the stage's gravity fluctuates: when normal, he stands on the floor, and when reversed, he stands on the ceiling. An image of him can also be seen on the touch screen while the segment is active.