Killbone

 is a prisoner at the Gravity Falls Maximum Security Prison.

History
In "TV Shorts 1," he is shown lifting weights in Li'l Gideon's Big House!.

Appearance
Killbone is a large, buff, dark-skinned man with black hair. He has a square head, a unibrow, small eyes with bags under them, a round nose, prominent lips, and a thin beard. He wears an orange prison uniform with ripped sleeves.