Torpedo (missile) Bill from Super Mario Sunshine.

Missile Bills are enemies from the Mario series. They are like Bullet Bills, but they are able to home in on Mario or Luigi. They debuted in Super Mario Bros. 3 for the NES, where they were distinguished by a slightly lighter color than the regular Bullet Bill. If the player dodges the Missile Bill, it'll try to attack the character again. If it fails once more, then it'll continue in a straight path and stop trying. Missile Bills also appear in the GameCube game Super Mario Sunshine, in which they are shot from Monty Mole's tank.