Well, I think if you really don't want to display past characters you should stick to just the ones you might come back to, or find a more 'out of the way' form of displaying the retired ones you won't use again (like maybe just a bottom bar of mini icons where you can hover for NAME | PB: NAME | GAME or something like that.
But yeah! I'm working on some paid work atm, but I'll definitely get a character gallery code worked out sometime in the next day or so. :)