Hmm. Pretty good, but substitute the keyhole and the key with Roxas' X and the MoM symbol, respectively, and get rid of the dots and the line on the crown, and I'd fork out a lot of munny for it.
Also, the order should've been Roxas / MoM, Heartless / Nobody, crown, Nobody / Heartless, MoM / Roxas. I know that out of those symbols, people identifies the Heartless emblem the most, but I think since Sora is the main character in the series, his symbol has to be in the spotlight.
Eh, I'm being nitpicky again. I think I should just design one myself.