This is Gunvolt. He's cool in-game because you can wipe out an entire squadron with him all at once, because of how his weapons work. He fights for ALL, and stops evil in it's tracks. His squad for this game is Quinn, Xiao, and the special muse, Joule (or Lumen). Joule came from the first game just like GV, so you should see the asg1 story for yourself before understanding half of asg2's story.