Hmm... we've already got a Dominique and a Zazie (the lil' kid ^_^)... so, sorry 'bout that. -_-
There are lots of male characters available... and I know most of these can't really be cosplayed feasibly, but I'm listing <i>all</i> the Gung-Ho Guns for the hell of it.
These are all that are available:
EG Mine (the dude with the spike shell)
Rai-Dei the Blade (the samurai)
Monev the Gale (the big-ass steiroid freak in the purple)
Grey the Ninelives (that monstrous robot thing)
Chapel the Evergreen (it's an anime-version LARP, so he'd be the one in grey with the red goggles. and just in case anyone hasn't seen it all and doesn't want spoilers, I'm not telling who manga-version Chapel is ^_^;
Leonof the Puppetmaster (the guy in the black with the funny lookin' hat and the glasses who attacks with the puppets)
Hoppered the Gauntlet (this one's difficult to explain. If you've seen the episodes with Vash + Wolfwood in Sky City, he's the freak in that weirdass shell thing)
And... I do believe that's all. Sadly, I think the only ones someone'd actually be able to cosplay would be Rai-Dei, Leonof, Chapel and <i>maybe</i> EG Mine... though that spike shell would be hard as hell to pull off, not to mention extremely difficult to move around in.