Billy is the main protagonist of The Grim Adventures of Billy & Mandy.
- Bantam (PPG)
- Stimpy (The Ren & Stimpy Show)
- Mr. Whiskers (Brandy & Mr. Whiskers) (can fit with Cream the Rabbit (from Sonic) as Brandy Harrington)
- Billy, Thomas, or Percy (Thomas and Friends; Both share the same first name)
- Billy ShoePack, Ten Cents, or Sunshine (TUGS; Both share the same first name)
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