I'll pop in with different characters over time, but I'll start with this guy.
I probably haven't mentioned his (lack of an) accent on TH before, but the "14-year-old transfer student from London who annihilated his accent within the first year to fit in" thing is 100% based on a girl I went to school with! His twin brother doesn't care what people think, which is why he still has more of an accent.
In terms of people I don't know, he's also based in some ways on Ricky Wilson (another creative guitarist with strange guitar tunings) and Jimi Hendrix (also played an upside-down righty guitar). The idea of twins in a pop punk band was based on Good Charlotte, and it's skewed pretty far away now, but originally his and his bandmate Roadie's relationship was inspired by the complicated and intense relationship between Carl Barât and Pete Doherty in The Libertines.