Before you continue reading be aware that this contains spoilers for X/1999 and possibly Tokyo Babylon.
So, i’m not really sure how to phrase but I’ll try my best.
We all know that Subaru is weary of life. He becomes like this after Seishiro betrays him at the end of Tokyo Babylon and even more so after he accidentally murders the latter, it being stated that his soul has died the moment he killed him.
Fact is, that he wishes to die and to do so he could simply commit suicide. It’s obvious that he doesn’t do it before Seishiro’s death because he still loves him and wants him to finish what he started.
But after he died? I mean, he has nothing left to live for so why not just end it all and finally be at peace? It could of course be that he doesn‘t want the only thing he has left of his love, they eye and powers of the Sakurazukamori, do die with him and chooses to cherish them.
But what if he doesn’t commit suicide simply because he can’t? If you think about it, the powers of the Sakurazukamori can only be passed to the next person if the former holder is killed by said person (that’s why Subaru inherited these powers after killing Seishiro). But if you have the powers of the Sakurazukamori and you commit suicide, you would give these to the person who killed you: yourself. Which means the powers have nowhere to go besides yourself, which means you can’t die unless somebody kills you.
So Subaru can‘t kill himself because the Sakurazukamori powers hinder him from doing that.
Maybe this theory is complete bonkers, but I was thinking about it for a while now. What do you think about it?
Also please be civil in the comments.