The Pierrot is a robot clown and one of Dr. Eggman's E-Series/Badnik robots. It appears in Sonic Advance's Casino Paradise Zone, balancing on a large circus ball and juggling smaller balls. It can only be defeated by spin-jump attacks since attacking its ball will repel the player.
In two stages of Shadow the Hedgehog - Cryptic Castle and Circus Park, respectively - Shadow encounters Egg Pierrots. They are actually Egg Pawns that have been stylized for the theme of the level; they balance on large circus balls while juggling Molotov cocktails, which they will throw at Shadow if he approaches. Striking the Egg Pierrot's ball will cause it to detonate, destroying the robot and damaging the player.