Once Warrior of Light joins the Pugilists' Guild, Hamon trains him and introduces Chuchuto, his assistant and first student. In the middle of training, the Warrior of Light discovers that an illicit drug called somnus is being smuggled into Ul'dah via Black Brush Station. They discover that one of the smugglers is actually Rurukuta, a missing pugilist who discovered that Hamon was weak and decided to leave the guild. Despite having discovered the truth about Hamon's condition, Chuchuto respects him no less and wishes to rekindle the fire of passion within Hamon.
Chuchuto believes that if Warrior of Light were to train the way Hamon did before, he can serve to cheer up his master again. Chuchuto asks the Warrior of Light to bring wasp stings, and this reminds Hamon of his youth and expresses his fervent desire to be like his old self again. As soon as the fight is over, his former rival, Weggfarr, arrives on the scene with Rurukuta. Having mocked Hamon's efforts, Weggfarr challenges him to a public rematch, with the Pugilists' Guild itself as the prize for the winner.
During a training session, Chuchuto and the Warrior of Light are attacked by Rurukuta and his minions. The duo manage to defeat Rurukuta and learn his true agenda. Rurukuta only wants his master to live, even if it means swallowing his pride and running away from the impending fight. Aware that Hamon is in good hands, Rurukuta says goodbye.
Once Weggfarr returns to Ul'dah, he is knocked down by Hamon before he even uses his axe. Not wanting to admit defeat, Weggfarr resorts to using a substance he calls pluton to increase his strength and comes at you in a frenzy. With Chuchuto and Rurukuta fighting alongside the Warrior of Light, they defeat Weggfarr and his minions.
Widargelt invites Hamon and his disciples to hold a cross-discipline match between the monks and the pugilists. Hamon, Chuchuto and Rurukuta travel to the Fringes but the match is cancelled before it even happens due to the intervention of Adri and his subordinates. Later, Hamon's party finds out about the duel between Widargelt and Adri and they go there to offer their forces to defeat Adri's subordinates.
Chuchuto Brightstar is an aliied npc in Special Instances in pugilist quest level 15 The Spirit Is Willing, level 25 Star-crossed Rivals, level 30 Return of the Holyfist and in monk quest level 70 The Power to Protect.