User blog comment:Silver-Haired Seireitou/Strongest under the Sun Tournament/@comment-9330998-20121113224327/@comment-9330998-20121114074604

He's Ikiryō Kuragari. Minor note - some descriptions of his zanpakutou abilities may sound exaggerated, but it's only because of wording. I intend to tweak it a bit in the near future.