The main characters are Saiki Kusuo and his brother Kusuke. Kusuo is a psychic who tries to live a normal life despite his extraordinary powers. He has abilities like telepathy, telekinesis, and more. Kusuke, on the other hand, is a brilliant scientist with a bit of an eccentric personality. He is often interested in Kusuo's powers and tries to create things related to them.
One interesting plot could be them working together on a scientific project. Kusuke is a scientific genius and Kusuo has his psychic powers. They might combine their abilities to create something extraordinary, like a device that can enhance Kusuo's powers in a new way.
Well, 'kusuo x kusuke brither fanfiction' might explore the complex relationship between Kusuo and Kusuke. It could focus on their different personalities. Kusuo is often more laid - back while Kusuke is highly intelligent and competitive. Fanfictions in this category might create various scenarios where they interact, like in a family - oriented story showing their brotherly bond, or in a more adventurous plot where their abilities play off each other.
Another theme is family loyalty. Despite their differences, they are brothers, and many fanfictions explore how deep down, they care for each other and will come to each other's aid.
Fanfiction.net is also a good place to look for 'kusuke x kusuo fanfic'. There are numerous stories written by different authors. Just use the search function and type in the relevant keywords. However, the quality may vary, so you might need to read a few to find the really good ones.