Dragon Ball Z
Majin Buu Saga
At fifteen years old, Idasa competed in the 25th World Martial Arts Tournament. He is very arrogant and first taunts Trunks with a missing punch, claiming that Trunks stood no chance at beating him which didn't concern Trunks. However, when in the ring, Trunks defeats Idasa with a sweep and a kick with barely any effort. When he loses to Trunks, his mother is as angry at him as she is at Trunks and she punishes him for losing.
Later, during the Majin Buu Saga, when Babidi is searching for Trunks, Goten, and Piccolo, Idasa tells his mother where Trunks lives and she immediately tells Babidi. Idasa is presumably killed by Super Buu's Human Extinction Attack and resurrected soon after by the Dragon Balls.