“The Rise & Fall of Sanctuary Moon” - hands down, no competition.

I really liked him in cowboy bebop… I also really liked that show.

Looking over his IMDB credits the first thing that stands out is that he’s been in a TON of stuff I’ve never even heard about. I obviously need to do some catch-up work. Of the stuff he’s been in that I have seen:

Cowboy Bebop - I didn’t really like the series as a whole, but I liked him in it.
Star Trek - I really liked his(their) take on Hikaru Sulu. The movies…eh… but his (and several other) individual performances were really solid.
H&K Go To White Castle - Incredibly stupid movie that’s also really damn fun.

Nice try, John Cho’s Lemmy account