Fat Robin (sometimes mistakenly called Robin) is an overweight teenager that runs around with Fatman, thinking he's a hero. Fat Robin was originally known as Loser Loser. He was a circus freak with his family. They traveled across the country impressing people with their lameness. Loser was raised like this, and this was all he knew. But then, one day, Calendar Man was celebrating a holiday, and killed Loser's family. He started eating because he was so upset. Fatman arrived weeks later, noticed that this boy was just like him, and let him be a sidekick.