Female gladiators! Nearly every MMO game I've played or even heard of have female and male options. There don't have to be penalties or bonuses or even any change in programming. It would be purely aesthetic. But this game could use some more eye candy.
I know this game is a business and you're in it to make money. If you want to see more traffic and more player retention then female gladiators is the way to go. Thanks for reading and good luck!