Justice.
Learn to draw well. Without understanding the fundamentals it will be impossible to create drawings that look as good as Guilty Gear. Once you have a good grasp of how to draw in general then it...
Guilty Gear XX is the video game, a game for the playstation 2 and titled Guilty Gear X2 and Guilty Gear XX
Daisuke Ishiwatari - http://en.wikipedia.org/wiki/Daisuke_Ishiwatari
If you mean like they did for Naruto, OP, and FMA then yes. It's actually a anime movie I think but I'm not suree