One idea could be that the heroes from MHA are transported to the Super Sentai world and have to team up with the Sentai warriors to fight a common enemy that is threatening both universes. Maybe a powerful villain has found a way to cross dimensions and is causing chaos.
Another plot could be that a character from the Super Sentai universe ends up in the MHA world by accident. This could lead to a lot of confusion as the MHA characters try to figure out where this strange, power - suited person came from. Eventually, they realize that they need to work together to send the Sentai character back home while also dealing with local villains who are interested in the Sentai's powers.
Perhaps the quirks in MHA are somehow combined with the powers of the Super Sentai. For example, Deku could learn some new combat moves from the Sentai members while they are in awe of his One For All quirk. They could then use these combined abilities to defeat a group of villains that are too strong for either group alone.
Well, there could be a story where the Super Sentai are on a mission and end up in a parallel universe that is a blend of Disney and their own world. They meet characters like Aladdin and his magic carpet. The Sentai could use the carpet to travel quickly across different locations in this new world while they search for a way back home. At the same time, they notice that some dark force is corrupting the beauty of this Disney - Sentai world. So, they join forces with the Disney heroes like Hercules to fight against this dark force and restore the balance in the world.
A cool plot could involve a villain who has the ability to steal the memories of the heroes. The Power Rangers and Super Sentai teams then have to work together to regain their memories while also fighting off the villain's minions. They could start with just basic combat skills and gradually remember their more powerful abilities as the story progresses.
All Might could play a significant role too. His status as a symbol of peace in MHA and his experience would be valuable. In the Super Sentai side, the mentor - like figure or the Green Ranger might be the counterparts. All Might could share his wisdom with the Super Sentai team while learning some new tricks from them as well.
One idea could be that the Kamen Riders and the Super Sentai teams are forced to team up against a common enemy that is too powerful for either of them alone. For example, a villain who can manipulate time and space, causing chaos in both their worlds. Another plot could involve a misunderstanding at first, where the two groups think the other is the enemy, but then they realize they are on the same side. Maybe there's a device or power that only works when combined from both franchises, like a special weapon or transformation ability.
One idea could be that the Avengers are somehow transported to the MHA universe. They have to deal with quirks while also trying to find a way back home. Maybe they team up with the students at UA to fight a common villain who has a power that combines both advanced technology and a powerful quirk.
One idea could be that Naruto characters visit the MHA world and have to adapt to the modern society and different power system. For example, Naruto might be intrigued by how quirks work compared to chakra. Another plot could involve villains from both universes teaming up, forcing the heroes from Naruto and MHA to collaborate. They would need to combine their unique fighting styles and powers to defeat the combined threat.
Another possibility is a crossover with the world of Naruto. The characters from MHA could participate in the Chunin Exams. Bakugo might be really into showing off his skills in this new and different kind of competition.
One idea could be a crossover where the heroes from My Hero Academia team up with the Super Sentai. They could face a common enemy that has powers combining the quirks from the MHA world and the mecha - like threats from Super Sentai. For example, a villain who can create quirk - enhanced giant robots.
An interesting plot could involve an OC who was initially an enemy, believing the Gekirangers were a threat to their own goals. But as the story progresses, they discover they have a common enemy. The OC then has to learn to work with the Gekirangers, overcoming their differences and prejudices. This would create a lot of character development and interesting interactions between the OC and the existing characters.
One idea could be a Sonic crossover with a superhero universe. Sonic's speed could be compared to the Flash's, and they could team up to stop a common villain who is trying to steal chaos emeralds and speed - force related items. Another plot could be a crossover with a fantasy world. Sonic meets magical creatures and has to use his speed to outrun dark magic. Maybe he teams up with a wizard or a fairy.