What could be an interesting plot for a My Hero Academia Re:Zero crossover fanfiction?

Subaru and Izuku would be an interesting pair. Izuku is a born hero with his strong sense of justice and his powerful quirk, while Subaru is someone who has to constantly struggle and rely on his return by death ability. Their different personalities and abilities would create a lot of interesting interactions. Izuku could inspire Subaru to be more confident in his own abilities without relying solely on his special power, and Subaru could show Izuku the value of perseverance in the face of extreme difficulties.

Maybe the plot involves a device created by Stark Industries that malfunctions and creates a portal between the two universes. The heroes from both sides initially have some misunderstandings and fight each other. But then they realize that there is a greater threat. The My Hero Academia students could learn a lot from the Avengers' teamwork and fighting styles, while the Avengers are impressed by the creativity of the quirks. They then join forces to stop a group of villains who are trying to use the portal to invade both worlds.

One idea could be that the Pokemon have Quirks. For example, Pikachu could have an electric - based Quirk that is even more powerful than its normal electric attacks. The heroes in training from My Hero Academia could team up with these special Pokemon to fight against villains who are also using Pokemon with dangerous Quirks. It would be a really cool mix of the two universes.

A possible plot is that the Reapers from Mass Effect start invading the world of My Hero Academia. The heroes would have to use their quirks in new and creative ways to fight off these giant mechanical threats. Maybe All Might could inspire the Mass Effect heroes with his unwavering spirit, while Shepard could teach the My Hero Academia characters about advanced military tactics.

One possible plot could be that the Omnitrix from Ben 10 somehow ends up in the My Hero Academia universe. Ben could team up with Izuku Midoriya. Ben, using his various alien forms, could help in hero battles against villains. For example, Heatblast could be useful against ice - based villains in the MHA world. And Izuku could learn a lot from Ben's experience in handling different powers and situations.

One interesting plot could be that a Prototype character, say Mercer, somehow gets his powers transferred to a My Hero Academia villain. This villain then becomes extremely powerful and starts causing chaos in a way that the heroes can't handle. The heroes have to figure out how to stop a foe that can shape - shift, regenerate, and has superhuman strength. They seek help from the Prototype world, and a character from there has to work with the heroes to find a way to reverse the power transfer or at least find a weakness in the empowered villain.

Well, the plot could involve a quirk experiment gone wrong that creates portals between the two universes. The Avengers and the MHA heroes end up on the wrong sides. At first, there's a lot of misunderstanding and fighting between them. But then they realize that there's a bigger threat behind all this chaos. For instance, Loki could be working with a MHA villain to take over both worlds. The Avengers and the MHA heroes then have to put aside their differences and work together to stop this evil plan. The story could explore how different powers interact and how characters from two very different universes grow to respect and rely on each other.

Well, it could be about the heroes from My Hero Academia getting caught up in the events of Infinity War. Maybe Thanos targets the quirks in the MHA universe. Deku might try to use his One For All to stop Thanos, seeing it as a great evil. And the Avengers could be confused by the existence of quirks at first.

One possible plot could be that a powerful villain manages to release a virus that turns most of the population into mindless, powerful mutants. The remaining heroes, including the students of UA, have to not only fight these mutants but also find a cure. Deku could be leading the group, trying to figure out how to use his new powers in this chaotic situation.

One possible plot could be Sans using his teleportation ability (from his original game) in the My Hero Academia world to outwit villains during a big battle. For example, he could suddenly appear behind a villain like Stain and disarm him before he even realizes what's happening.