Blinky: red ghost
Pinky: pink ghost
Inky: cyan ghost
Clyde: orange ghost
They turn blue whenever Pac-Man eats the Power-Pellets.
Bad (sometimes neutral)
Keep Pac-Man from eating most of the dots in the maze
Pac-Man, Ms. Pac-Man, Jr. Pac-Man
Powers and abilities
Ghosts are the main antagonists of the Pac-Man franchise. They are a quartet of monsters chasing Pac-Man around the maze to keep him from eating all the dots. The power-Pellets are the ghosts' weakness, when Pac-Man eats one, the ghosts turns blue and Pac-Man can eat them.
Blinky: Red Ghost who relentlessly chases Pac-Man.
Pinky: Pink Ghost who ambushes Pac-Man.
Inky: Cyan Ghost who scares Pac-Man into making the wrong move.
Clyde ( Sue in Ms. Pac-Man and Tim in Jr. Pac-Man): Dimwitted Orange Ghost.