Oin

Before Oin Saga
After Oins father was killed in a sayain rampage he devots 3300 years of his life on 1. getting the energy for Chuu and 2. Releasing him. He made Chuu to kill Sayains and anything that gets in his way

Oin Saga
After discovering sayain are on Earth he decided to set off Chuu's energy to lure them from the tournament and knock them out so and puts them in 5 challenges in his ship to test if he really needs to Chuu to kill them

Chuu Saga/His death
After commanding Chuu to destroy the planet to no avail Demise fires a kiblast at Oin to deal damage buy after it misses Chuu gets tired by Oin's annoyance and redirects the blast to hit him.