Yhwach

As the formidable Emperor of the Wandenreich, this powerful Quincy leader commands the elite Sternritter army. Having survived a legendary, mysterious encounter with Yamamoto Genryuusai a millennium ago, he seized the opportunity to invade the Soul Society during Ichigo Kurosaki's absence. During his ruthless campaign to exterminate all Shinigami, he easily overpowered the mighty Kenpachi Zaraki, only to be interrupted by a vengeful Yamamoto just before delivering the final blow.