Some Re:Zero fanfic ideas, crossover mostly

Re:Zero X Kirby idea

This is an extremely modified version of an idea created by some unknown person that I'm pretty sure isn't being used for anything. Version where I integrated the ideas to make easier to read(more ideas in a less organized form below first one)(spoilers to arc 5-8, Ex2, Ex3, Kirby Return to Dreamland Deluxe throughout):

Story: Satella tries to summon Subaru like normal, but she messes up and sends him to Halcandra instead of the Re:Zero world(and also him being summoned from the normal time, but to quite a bit before he normally would get to the world of Re:Zero or Another Dimension messing with time). Subaru finds himself out of Japan and stuck in the junkyard known as Egg Engines. He then survives the harsh environment while befriending some random locals, using an teacher program that he found and has auto-translation, or something in order to learn the language, then starts reading stuff on the computers around the place. He finds records on how to do magic and learns how to do magic(magic exactly like or very similar to Magolor's magic). He also found some vague warnings about some Crown at the Volcano and some ship known as the Lor also being there. He decides to go to the volcano, seeing it as his most likely way home, potentially being attacked by Metal General and HR-D3 and being forced to either sneak around them or defeat them(possible discovery of Return By Death). He then goes to the volcano at the top of Dangerous Dinner, then starts excavating. Once the Lor Starcutter is activated, Landia awakens. He feels an extremely strong impulse to get the Crown on Landia's top head, attacks Landia with the newly excavated Lor Starcutter, and dies, Return By Death activates, and he decides to set up the ship in order to possibly go home, collecting Energy Spheres, including fighting some Sphere Doomers for some and possibly seeing Grand Doomer, among other activities. While doing that, Landia is overtaken by the power of the Crown and goes to Decisive Battlefield, Dream Kingdom as Parallel Landia and is defeated by Team Kirby(Kirby Clash version) then goes home after being defeated. Subaru notices that Landia is weakened and defeats them, then grabbing the Crown(or the Crown falls off Landia without battle and he grabs it), but doesn't put it on yet, despite feeling a very strong impulse to put it on. He then takes the Lor Starcutter through Another Dimension to Earth, just to find it as Shiver Star. Being heartbroken by this, he falls to the impulse and puts on the Master Crown and it's corrupting influence causes him to decide that him ruling everything is the only way to prevent this from happening again, and decides that a new ruler needs a proper form, changing to something that is very similar to Traitor Magolor(Eldritch Subaru)(Note: When Magolor changed to Traitor Magolor form, his font changes).(He didn't find wherever Adeleine and Samus came from) Subaru then goes to the easiest to access place to start, which happens to be the Re:Zero world thanks to isekai'd people and Satella. Eldritch Subaru then goes through Another Dimension, encountering and defeating Grand Doomer(could have the transformation be here instead)

Eldritch Subaru enters Lugunica to find the Demi-Human war happening. He decides to attack all sides, including the Witch Cult and some random towns both in Lugincia and across the Vollachia border and makes it very clear where he's going next. The Demihuman side, Lugunica, Witch cult, and Vollachia each send a force to subjugate him(In addition to important characters in Ex2, unsure who Demihumans send other them regular soldiers and Valga Cromwell, Lugunica sends knights and the Divine Dragon possibly with king, Clind?, Witch Cult sends a bunch of Cultists and multiple Archbishops, and Vollachia sends a small scouting force of shinobi or something), along with Melakuera joining in(Great Fire Spirit from Memory Snow OVA, Eldritch Subaru is definitely a threat to peace and order) and when they get there, they get ready to attack each other before Eldritch Subaru appears and does an entire speech about people being too dumb or weak to rule themselves, defend themselves from outside threats, or something, to be interrupted by a now non-corrupted Landia. He then says something about how that's all or the majority of the resistance of note and how this is not a place worthy of the final battle, saying it deserves a worthy arena, opening a portal to Another Dimension and telling them to follow him or wait for him to build up a critical mass of Sphere Doomers or something while summoning 2 Sphere Doomers), Thresia is able to draw the Dragon Sword against him during this.