[Crossover] Hello, I'm a Walking Cheat

Hello, everyone. My name is Shiranotera Shiro, and I'm a Soul Reaper. Even though my Zanpakuto can use Bankai, I don't have enough spiritual power, so I'm still only a Fourth Seat. My Zanpakuto is completely useless. Its Shikai can only control one random element. According to the Zanpakuto itself, its Bankai can control worldlines. I don't understand what that means, but I figure it'll be just as useless as its Shikai... That is, if I hadn't transmigrated across worldlines. #Urgent help needed: how do I get back to my original world?!##So can everyone see Soul Reapers these days?!!##And since when are Soul Reapers skeletons carrying scythes? You have to be kidding me!#