In
DragonBall Z, Gotenks is the fusion between
Vegita's son
Trunks and
Goku's son
Goten. He is very over confident in his abilities and is fairly ineffective.
According to PlanetNamek.com, his abilities include: Bukujutsu, Dai Kaiten Kick, Dynamite Kick, Galactica Donut, Gekitotsu Ultra Buu Buu Volley Ball, Jigen ni Ana o Akeru, Kame Hame Ha, Miracle Super Punch, Power Tackle, Renzoku Shine Shine Missile, Rolling Thunder Punch, Super Ghost Kamikaze Attack, Ultra Missile Punch, Wild Boar Attack, and Zanzoken.
For more DragonBall fusion fun, check out Gogita and Vegitto.