The Gunk Knuckler is a male monster that lives near Boopelite in a forest. He used to scare various people in the woods and various locations but stopped in an effort to become good.
The Gunk Knuckler loves to bake cookies and peaceful activities. However, he can't stand being called a wimp. In "Underpants-Palooza", Banana took advantage of this by repeatedly calling him "wimp" until he began to chase him down, leading to the campfire where the Junior Rangers were sitting. All of this was because Banana wanted to make the Junior Rangers poop their pants, since they made him do so earlier in the episode. Banana succeeded but also put the Gunk Knuckler back into his evil phase.
The Gunk Knuckler, being a monster, is very tall. He has dark red eyes and thin legs. He is a light beige color.