Clyde is one of the four main ghosts in the Pac-Man series. While the other three ghosts are off chasing Pac-Man, Clyde will be off doing his own thing. He is typically portrayed as the least intelligent and most submissive ghost. He is good friends with Blinky, Pinky, and Inky.
While originally one of the main antagonists in the first Pac-Man arcade game, his role has largely been diminished to being a secondary antagonist or an ally in recent incarnations.