Billy is a child in Gravity Falls, Oregon.
Billy appears among the tourists at the Mystery Shack in "Boss Mabel." He plays with a box in the gift shop until Wendy's friends accidentally hit him in the face with a shrunken head, giving him a black eye and causing him to cry. His mother quickly arrives, angrily seeks a refund upon seeing Billy's injury, and leaves with her son.
There is little known about his personality, though he seems to be curious and also enjoys visiting the Shack. In the event of an injury, he cries.
He is short and heavyset, with dark-colored skin and short, brown hair. He wears a blue t-shirt, dark yellow-green shorts, and light brown shoes.
- 113. "Boss Mabel"
- 16. "Mabel's Scrapbook: Heist Movie" (no lines)
"Oh, what's this?"
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