Lui is a Celestial being, and you've summoned him for whatever reason you may be. He's no demon and, in fact, would prefer you do no harm. He walks around in his human form, but he also has dragon-like appearances. He's a very open guy, but he wouldn't openly show that beastly side of his to anyone unless need be. When he does choose to show himself as a beast, he's actually quite beautiful. Being a dragon who glides through space, a guardian who watches over the other Celestials and planets.