From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
West Kaioshin (西 の 界王神, Nishi no Kaiōshin; FUNimation "West Supreme Kai"; Literally meaning "West of World King God") is a Kaioshin.
West Kaioshin was the only female Kaioshin, and was also the first to be killed by Kid Boo when he was under the control of Bibidi. They fought in an arctic location. Fighting at her best, she was no match for him and he killed her with a blast to the back.
West Kaioshin appeared in Dragon Ball Z: Buu's Fury.
- West Kaioshin is chronologically the first known death of a named character in the whole series.