Super Kai

Buubuu was a Supreme Kaioshin one million years prior to the start of the Dragon Ball Generations series, the inventer of the Ultimate Potaras, and, coincedentally, one of it's first users along with Olormi. Bumi, his and Olormi's fusion, is still alive by the time of Dragon Ball Generations, and is the Western Supreme Kai.

Background
Buubuu, as a Kaioshin, was born from a golden Kaiju around 1,000,852 years before the start of DBG, and was made the Western Kai. He invented the Ultimate Potaras at an unknown point in time. He later fought a human villain named Olormi, and discovered that the only way to beat him was to fuse with him. He placed the earring on Olormi's left ear, and initiated the fusion, forming Bumi.