At first, Sōsuke Aizen seems like the responsible, slightly nerdy captain of the Fifth Division in the Gotei 13. He's a loyal member of Soul Society who is perfectly content to work within its rules. Then, when he is mysteriously "murdered," everyone blames Ichigo and his fri...
and his powers of regeneration come in very useful. It might sound like your typical isekai, but it's refreshingly self-aware. When he first pops up in Lugnica, Natsuki says, "Is this one