Suniju Kenpachi

Suniju Enputi (エンプティー 数二十, Enputi Suniju) is a Shinigami, one of the Shikō and one of the three kings of Hueco Mundo.

Background
Suniju was created, in a similar fasion to Nemu Kurotsuchi, by the Twelfth Division, but with a special purpose - to be the fastest creature in any world. He was created with implants in his arms to serve this purpose. He eventually found this out and ran away, being found by a member of the Seventh Division who adopted him. Around this time, he took the name Suniju Enputi because he is the twentieth creation in his line (Suniju means "Number Twenty") and the empty feeling that he has inside him.