All Might would be a great character to include. His status as a symbol of peace and his powerful quirk could play a significant role. He could act as a mentor to the Big Three, guiding them through difficult situations. Todoroki is also a good choice. His dual - natured quirk and his complex family background would bring depth to the story. He could form an interesting bond with Tamaki, perhaps helping him come out of his shell more.
Midoriya could be an interesting addition. His growth and determination would contrast well with the Big Three. He could learn from their experiences and they could be inspired by his never - give - up attitude. Another character could be Bakugo. His explosive personality and powerful quirk would add a lot of drama and action to the story. His rivalry with the Big Three, especially Mirio, could create some intense moments.
One possible plot could be that the Big Three - Mirio, Nejire, and Tamaki - are transported to an alternate universe where they have to team up with their counterparts from different versions of BNHA. They face new villains and challenges that require them to combine their unique quirks in unexpected ways. For example, they might encounter a villain who can manipulate time, and they have to figure out how to use Mirio's intangibility, Nejire's wave motion, and Tamaki's transformation quirks to stop the villain before he destroys the fabric of the universes.
The characters in the 'bnha big 3 fanfic' are centered around Mirio, Nejire, and Tamaki. However, depending on the plot of the fanfic, it could also involve villains. Imagine a scenario where the big 3 have to face a powerful villain who has a quirk that specifically targets their weaknesses. This would not only showcase the abilities of the big 3 but also introduce new and exciting elements to the fanfic.
Reyna Ramirez - Arellano can also be a great addition. Her leadership skills and her connection to the Roman side of the mythological world can bring a whole new perspective. In a fanfiction, she could be the one who brokers a deal between the Greek and Roman demigods when the Little Big Three are caught in the middle of a conflict between the two camps.
Definitely, Cisco Ramon from Flash. He can add some tech - savvy humor and his ability to create new gadgets can be really useful in the crossover. For example, he could make a device that helps Supergirl deal with a new type of kryptonite - like threat.
Obviously Naruto and Rias themselves are very interesting. Naruto's determination and his never - give - up attitude can bring a lot of energy to the story. Rias, with her devilish charm and leadership skills, also adds depth. Sasuke could also be an interesting addition. His complex relationship with Naruto and his own power - hungry nature could create some interesting dynamics when combined with Rias' world. And Kiba from Naruto's world, with his dog - like abilities, could be an interesting contrast to the devil characters in Rias' world.
One idea could be exploring their training days before they became so well - known. Maybe focus on how they overcame their individual weaknesses. For example, Mirio could be shown struggling with a new type of quirk - based obstacle and how he found a creative way to get past it.
Sasuke would be a great character to include. His brooding nature and powerful Sharingan abilities would contrast with the more carefree Yoruichi. He could have some sort of rivalry or begrudging respect for Yoruichi's skills. And his relationship with Naruto would add another layer of drama to the crossover, as they could have different opinions on how to deal with the new situations in the Bleach world.
Vegeta would be a great addition. His rivalry with Goku and his pride as a Saiyan would add an interesting dynamic. He might be initially jealous that Goku is getting to fight and train with the God of Destruction. But then he would also want to prove himself and join in the action. Whis could also be included. His knowledge and calm demeanor could help in situations where the power of Goku and the God of Destruction gets out of hand.
Sasuke is a great character to include. His cool and brooding personality can create interesting dynamics in crossovers. For example, if he crosses over into the world of Attack on Titan, his skills as a ninja would be put to the test against the Titans. Another interesting character is Kakashi. His laid - back yet highly skilled nature can add humor and action to crossovers. He could be a great addition in a crossover with the world of Inuyasha, sharing his knowledge of combat and jutsu.
Solid Snake is an obvious choice. Since they are from the same general franchise, their encounter could be filled with a lot of drama and action. They could have different views on how to handle certain situations, which would create great story tension.