Hey guys ive been working on a game and i really need some help designing characters, im a pretty good artist, at least good enough to draw what i need but ive basically run out of ideas for character clothing, hair, and possibly stance. There's about 10-15 characters, taking place in an urban setting, and it revolves around mainly hand to hand combat and i was wondering if you guys had any ideas?

I taught an online course on designing a cast of characters. The written lessons are still available here: http://deviantart-academy.deviantart.com/gallery/34014800
Specifically it sounds like you need to look for more source images, either online or in magazines or both.