Re: What would you listen to
Aside from the obvious mentions:
JFA (THE quintessential skate punk band, if you were in California in the '80s and had a board, you were almost certainly listening to this band)
Free Beer (but finding their stuff is hard online because there's approximately 1 million Free Beers around)
The Faction (Steve Caballero was in the band)
Then yeah, all the obvious early hardcore bands like the ones already said and Middle Class, Ramones, etc. Around the mid-80s DRI would have had enough of an influence that thrash snuck in to the music (see how many hardcore bands went metal). If you want suggestions on specific albums etc give me a shout.
*these bands were all for Oxnard around '82-'84, which was one of SoCal's most notorious skate & hardcore regions, so if I was doing some sort of character based on those things, these are bands I'd have to include.