>>30043553 #I have a fan-canon that for whatever reason, Rushia's soul split apart and went to different multiverses in different time periods.
MiguelCatto is the soul that has the memories of Rushia and is aware of her other soul. She has some of Rushia's powers although very weak.
Nazuna in the meanwhile doesn't have the memories of Rushia but does have the bulk of her powers. Albeit, she isn't aware of them.
If the two were to ever fuse, we may get Rushia back.
Sorry for my lore autism there. 
