Being MGS obsessive, Metal Gear Solid : Portable Ops. Not a comedy, but it's great to play, despite a few graphical issues.
Anyway, mainly I'd recomend the Ratchet and Clank series. Size Matters and Secret Agent Clank are great games, and humourous too.
Lastly, Star Wars : Battlefront 2. I got addicted to this easily, gave me about a month non-stop play.
Other than those, I can't see any that you either have said you don't like (Sonic Rivals), or that just suck like Sims 2 on PSP.