Rattleballs (character)

Rattleballs is a gumball robot introduced in the eponymous episode Rattleballs. He was designed hundreds of years ago by Princess Bubblegum to protect the Candy Kingdom. After PB kills his fellow gumball robots for being too violent, he hides out in a junkyard. When Finn alerts PB to Rattleballs' continued existence, she tells the Banana Guard she has killed him, but secretly reappoints him "Sir Rattleballs", charging him to protect the Candy Kingdom from the shadows.