Tsune (Void King series)

Tsune (常, Eng: Infinity) is the consciousness of the Hōgyoku having taken on a human form following the defeat of Sōsuke Aizen at the hands of Ichigo Kurosaki, Tsune sees itself as an empty being given that it was created by the hands of other living beings and therefore unnatural, this becomes the chief reason why he seeks out the throne of Hueco Mundo and rulership of all Hollows and Arrancars in opposition to the Soul King.

A running theme is that Tsune seems to see Aizen as his father, and commonly speaks of him with that title, however given that Kisuke Urahara was the second person to come across the Hōgyoku he seems to not care for him whatsoever.

Trivia

 * Tsune is a Japanese word meaning "endless time", "infinity", "sempiternity".
 * Tsune's voice actors are Takehito Koyasu (Japanese) and Will Friedle (English).