Lite-crossover idea: Have the Re:Zero world happen to be in any media universe that has characters go between multiple planets up to entire universe calamity events, but it is just in the background and has to deal with whatever calamity until it's resolved, the biggest possible change in the plot of the original franchise is replacing one of the several planets that the cast visits happens to the the Re:Zero world, adding it to the list of planets they visit, and/or someone from the Re:Zero world becomes a member of the cast then goes back to the Re:Zero world after the events are done. For example, there is so much that can be done with Kirby, such as Dark Matter possessing people then Kirby & friends do their thing during Kirby 64, Haltmann Works Company doing their thing to the Re:Zero world at any point pre-Planet Robobot, or during Star Allies, some of the Jamba Hearts ending up there and possessing and powering up characters then being retrieved by a Jambastion with members of the Void Termina cult, possibly with Kirby and the Star Allies being there briefly(Meta Knight has been seen to master a power he got from possession after the possession, so that could happen. Also I guess some Friend Hearts could do something). Could also do Mario by just having Bowser cause trouble there then Mario helps out and Grabs a couple Power Stars during Galaxy/2. Metroid: a random small group of space pirates attacks them without telling the space pirate organization at large or any other organization about their existence or an Leviathan lands on the Re:Zero world. Kingdom Hearts: heartless appear and Kingdom Hearts characters occasionally appear during the plot, light and darkness.
Could also any large/scale battles able to be seen from the Re:Zero world in any of these franchises, but not interacting with them, so we just have people looking up at night and seeing stuff such the Star Allies vs. Void Termina(at least that part with the absurd amount of lasers) or something like a Star Wars space battle.
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Some Re:Zero fanfic ideas, crossover mostly
FanfictionThis was originally a big Sonic X Re:Zero fanfic idea, adding other ideas here that I felt were worth keeping. Ideas originally posted to Reddit by me(will update every so often), spoilers for stuff beyond S2 will be here, but after a warning that c...
