John "Ripster" Bolton is the leader of the Street Sharks. He is the smartest and the oldest of the Bolton Brothers. He enjoys creating inventions; taking up most of his knowledge and skills from his father. He's also an avid pool player. In the first episode, he's seen riding a motorcycle. when he's changed into Ripster, he becomes a Great white Shark, with teeth that can chew even through steel.
- Ripster is voiced by Lee Tockar.
- Ripster, El Swordo, Rox, Manta Man, Moby Lick, and his brothers will guest star in the Pokémon crossover, Ash Ketchum Goes Over the Hedge. He, along with his friends and brothers, join the Ash's Adventures Team at the end of the film.
- Ripster bonds really well with Clemont for they are keen scientists and have a passion for inventing things. He even has a close bond with Ash Ketchum due to his leadership, bravery, wisdom, and love for his Adventure Team.