Dragon Ball: Ancestors

Biography
Kaiyan was a young, gifted and powerful saiyan who was a part of a group of very gifted saiyans called The Barbaric Saiyans that ws formed by Veggie after one of his relatives told him to form a team of elites. Kaiyan was one of the most powerful saiyans amongst the group who desired immortality, wanting to live for eternity, and wanted to create a spell for immortality. Kaiyan worked for a powerful saiyan named Veggie (who would become the oldest known ancestor of the Vegeta bloodline), who was one of the most powerful Saiyan in history and was also his best friend since childhood.

But with a unhappy life and was sold into slavery. This trauma ultimately drove him insane, and paved his way into becoming one of the world's most ruthless mercenaries. as Kaiyan was the personal factotum to Veggie.

Wanting revenge on Veggie he would escape and learn to strengthen his base form to survive as a stray saiyan. It was at this time that Kaiyan had wished for immortality via the saiyan planets dragon ball and had become the world's very first immortal being. Kaiyan then tracked Veggie down and was strongly enraged and deeply hurt about his treatment as slave due to being a low class warrior. Out of revenge, he found Veggie, petrified him and killed him. Which left many of Veggies children devastated

Over time Kaiyan wonder abouts of other planets until he found a planet full of found saiyans that were banished from Planet Sadala Kaiyan trained their and mastered his strength from this lady of whom he was in love. Unfortunately for him many saiyans were aware of his actions as killer of the royal hyannis Veggie, this left him not safe so the saiyans of sadala sent a bounty hunter after him by the name of Bourne (a guys name who is a pun on bourbon) what Kaiyan hadn't known was Bourne was one the many legendary saiyans.