Y Ddraig Goch

Y Ddraig Goch (レッド·ドラゴン, Yu Doreegu Goku) was a draconic Vasto Lorde class Hollow who had the unique ability to seize control of Hollows who were of equal or less power than himself. Known to have caused severe destruction in certain parts of both the Rukongai and the World of the Living, he was finally slain by Asumu Godai.

Trivia

 * His appearance is based off of the Red-Eyes Zombie Dragon, a powerful monster in the famous Yu-Gi-Oh! card game, as well as the author's favorite card.
 * His name, Y Ddraig Goch, is Welsh for "The Red Dragon". This is a reference to the National Flag of Wales, which symbolizes a red dragon.