"Because of his nature", Tyler works night jobs where he sabotages companies and harms clients. He also steals left-over drained human fat from liposuction clinics to supplement his income through soap making and create the ingredients for bomb manufacturing, which will be put to work later with his fight club. He is the co-founder of Fight Club, as it was his idea to instigate the fight that led to it. He later launches Project Mayhem, from which he and the members commit various attacks on consumerism. Tyler is blond, according to the Narrator's comment "in his everything-blond way". The unhinged but magnetic Tyler becomes the antagonist of the novel later in the story. The Narrator refers to Tyler as a free spirit, which could almost be a mantra: "Let that which does not matter truly slide."
Link definitely NSFW, but funny as hell.