Akasha Shishidou
Perhaps one of the pithiest villain after knowing the reason behind his betrayal against the Kougon Cult. In his youngest days, he was one of the top ace in the Cult. He was proud and strong in his faith, till one day - he was forced to kill his Shikabane Hime, who is his fiancee when she was alive.
After being forced to kill his own Shikabane Hime, he went into exile for 5 years. No news about him was heard till series of recent events - Resurrection of many Corpse cases.
The truth about the lies behind the promise of Shikabane Hime killing 108 corpse to ascend into heaven
It is eternal condemnation of the soul instead.