Gun Grinner is one of the five Monster Minds in Jayce & The Wheeled Warriors. Like all of the Monster Minds, the original Gun Grinner does not take part in battles directly and merely directs his multiple clones in battling the Lightning League.
In his rarely-seen humanoid form, Gun Grinner has an elongated orange head and has segmented limbs like an insect. He stands as the shortest among the humanoid Monster Minds. The vehicle form of Gun Grinner resembles a Jeep with a menacing face. Between the vehicle's teeth are three laser guns and a long vine ending in five barbed flails extends from the top of the vehicle.