I'm screwed...I've never created a character with stats. And I'm not real sure where to begin either.
Clear the slate, make it DOA style, no weapons, no magic; just physical prowess. You could make it more even, by planning matches that're gonna be competitive. Put Sienna's little chorus girl up against my darling little seamstress elf and get giggles when the claws come out? That way you dont have to worry about stats, their rolls'd be pretty much equal.
Naturally, I am all for a tourney with a losers and a winners ladder. And to spice things up, make the battles three-way & last man standing config.