Here are some ideas for some fanfiction. They will be more focused on the Lee Brothers as they are one of my favorite characters on the series. Well, here they are.
Ouran High School Street Frighters
When Street Fighter's famous twins meet another famous pair of twins, things can go crazy. After getting into trouble too many times, Yun and Yang's grandfather sends them to Ouran Academy until things settle. But when the Lee Brothers cross paths with the Hitachin Twins, things could get messy. And if that weren't enough, there's also a mystery about some students who have gone missing.
Magic and Martial Arts
When it is discovered that Hoimei is a fairy and she has been invited to attend Alfia, the Lee Brothers go to attend Red Fountain to stay close to her. But when Shadaloo starts working together with the Trix, the Brothers, Hoimei, the Winx, and the Specialists must work together to stop them.
That's all I've got. Let me know what you think in the comments. Thank you.