MO-J4, also known as "BOT-BOT MO-J4", is a character from Star Darlings. He is the robot assistant to all twelve Star Darlings.
MO-J4 is a diminutive navy blue robot with a black visor, where his "face" is located; the visor also display MO-J4’s expressions. On each side of his head is a gray speaker that acts as his ear. A star emblem is located on his chest.