HopOffMe
I think i understand the story has already ended the mc has become the scarlet king in the outer verse. But as he was bored he tored his souls and because of the time that has passed the soul is his own "persona" let´s say. So what we will be seeing is the soul adventure into the omniverses encountering all of his previous persona "Scarlet" things and seeing how he interact with scarlet sons. But think of it like kind of Aizen and Ichigo. You can also take for exampke someone cuts his own arm and then he goes to the cinema to see what that arm could do.
It would be interesting to have fun in the multiverse without a super op skills as long as he can travel worlds but... if a guy who loves anime goes to those worlds... why not also get all the waifus ? I mean, you go to your dream worlds and see the best girls , shouldn't he have a feeling to collect them all ? Adventure is no only traveling and seeing things but also in the flesh and pleasure of the body.