Design #1: Margin doodle
Amazingly, Diesel is the Pennyverse's oldest character. Caby would doodle him in her notebooks back in high school, dating him to about 2016 or 2017. He originally had a beret and goatee, and she once described him as "kind of an asshole".
Design #2: Diesel
The beard and goatee were lost. The asshole bit was not. We decided to pair the idea of a wet, dripping, disgusting cold fish with a tendency to flirt with anything feminine. Diesel was complete.