Shi Yomi (LoDs)

Shi Yomi was a Quincy that was transformed into a Vasto Lorde-type Menos Hollow due to the experiments Sōsuke Aizen carried out on his prototype Hōgyoku, he and his maternal twin brother were a terrifying Hollows that was feared by even Baraggan Louisenbairn, King of Hueco Mundo and Lord of Las Noches.

Shi and his brother Neru became the first member of the Pesadilla before its official founding, he believes that he and those with the Fracta that followed Sōsuke Aizen were the equivalent of Gods, he appears in the Lords of Dread series.

Trivia

 * Shi is a Japanese word meaning "Death".
 * Yomi is a Japanese word meaning "Hell" or "Underworld".