Bob are the alien creations and minions of The Source in the Teen Titans series.
He first appeared as Beast Boy's manager at his new job at the Meaty Meat. He can even create burgers, and become clones of him. When Beast Boy threatened to eat The Source for lunch, he immeadiately told the secret on how to defeat the clones of Bob, which is water.
Later, Beast Boy killed the Bobs with water, then they're all turned back into tofu. Bob was later seen joining the Brotherhood.