I know I already pitched the idea but I looked up more JJK and Re:zero stuff and honestly Subaru being Yuji or similar to Yuji like being a cursed womb or something. Hell, he could be related to Yuji. Would I have him be a vessel for Sukuna? Probably not, but then there's the possibility of him being a vessel for Satella. Any fragments of her that he can take in order for it to work or something, idk.

Literally, look at all this.

Literally ya'll. Just tell me the story wouldn't be straight fire.