|This article belongs to the Classic Continuity|
|This article is about the alien. You might have been looking for Billy Billions.|
Billy is somewhat hippo-like in appearance. He has a big pink nose and red hat. He has orange and white skin and wears a blue and white T-shirt.
In Omniverse, Billy looks similar, but his ears and nose are darker and he is noticeably slimmer.
- Ken 10 (first appearance)
Ben 10: Omniverse
- Special Delivery (first re-appearance; cameo)
- Bengeance Is Mine (cameo)
- Cough It Up (cameo)
- No Honor Among Bros (cameo)
- Clyde Five (cameo)
- He is a parody of Billy from the TV series, The Grim Adventures of Billy and Mandy. He is even voiced by the same voice actor, Richard Steven Horvitz.
- According to himself, his dad is "just a boring old dentist."
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