Stew stars in both Adventures in Retail and the spinoff, Adventures in Roadtripping. He hates his job and has no respect for the customers.
In AiRoad, he accidentally burned down the store and they're just about to head out on their road trip.
Jonn also appears in both AiR and AiRoad. He instigitates the fire making by forcing Stew to juggle, which he isn't very good at yet.
Evan is the only character with a last name. Stew and Jonn leave a note in AiRoad explaining that Evan set fire to the store. The roadtrip they are about to embark on is what will keep Evan from being arrested.