I'm fascinated by transmigration as a fic trope in cnovels, which seems to fall into two broad categories: a) self insert into my fandom (which might be history) and b) going back and fixing mistakes. And when you think about it, the attraction of both is obvious. But it is also interesting to see them as a sort of portal fantasy but without the angst of "But will we return to our real world, or keep the world and life we built here?" I dunno! I just think it's neat!.