I dunno if he's SB's cockroach pal... Strong Bad refers to him as "Gavin the Interrupting Cockroach" in one of the early Tandy 400 emails... he said, "Go away! I'm trying to check my freaking email!" - Douglas

which email?

None. Douglas is referring to the easter egg in personal favorites. -CE5

I don't think he was is SB's room. That was definitely a different cockroach. If you zoom in, you can see that it's different. -CrAp

Maybe Gavin has matured since then. - Do cockroaches hit puberty?

I don't think he's a reject anymore, y'all. I'd say he's at least as much of a character as those two Halloween kids. -socetew