Ultharon the Mighty

"There are those of us who choose to deny the fate that has chosen them. I believe that fate can be changed, it just takes time, work, and oceans of Shinigami blood!" -Cervantes, before fatally stabbing Yamamoto.

Cervantes the Lost is an Archdemon, and amoung the first of the Hollows. Older than both Yamamoto and the Central 46, and said to hold power equal to that of all 13 captains combined.