One idea could be that Sakamoto and Kouta meet in a school setting where they initially have some misunderstandings but gradually become friends and then something more. For example, Sakamoto might be a new student who is very reserved, and Kouta, being the outgoing one, tries to break through his shell.
They could be in a post - apocalyptic world together. Sakamoto has some special skills in survival, like being able to find hidden water sources, and Kouta is good at building shelters. They team up and as they face various challenges, their relationship deepens from comrades to something more romantic.
Maybe they both participate in a local music competition. Sakamoto is a shy pianist, and Kouta is a singer. They decide to collaborate for the competition. At first, their different personalities and styles clash, but through the process of rehearsing, they start to understand and fall in love with each other.
Sakamoto and Kouta are likely characters that fans have created a relationship for in fanfiction. They could be original characters, or perhaps characters from an existing series that the fanfiction writer has chosen to pair up in a new and creative way.
A more light - hearted fanfiction could be based on a school setting. Imagine Sakamoto being the new transfer student in Kira's school. Kira is initially suspicious of Sakamoto but then discovers that they both have a shared love for a particular type of music or art. This leads to them collaborating on a school project and their relationship blossoms from there.
One plot idea could be Eri and Kouta teaming up to help other children in need. Since Eri has her unique quirk and Kouta has his own abilities, they could use them to bring comfort and protection to kids who are in difficult situations. For example, they might find a group of children who are being bullied by villains with weaker quirks and use their combined powers to fend them off.
One interesting plot idea could be Akira and Ryuji going on a secret adventure outside of the main events in their story. Maybe they discover a hidden part of their city that holds a mystery related to the Metaverse. Another idea is a story focusing on their friendship growth, like when they have a fight and then have to work through their differences to become even closer friends. It could also be a story where they team up to help a new character who is having trouble adjusting to their world, showing their kind and helpful sides.
Maybe X - 23 is on the run from some anti - mutant forces and finds herself in Gotham. Batman initially suspects her but then realizes she's being hunted unjustly and decides to help her. They then have to fight off the hunters while also dealing with Gotham's regular villains.
A plot where 707 and MC get trapped in a virtual world that is a distorted version of their own reality. They need to find a way to escape by solving puzzles and relying on each other's unique skills. For example, 707's hacking abilities could be crucial in finding glitches to break free.
One idea could be that the OC is a healer who stumbles upon Frankenstein's monster in the woods. The OC decides to help the monster, despite the danger, and they form an unlikely bond. This could lead to a story of redemption for the monster and a journey of self - discovery for the OC.
A plot could revolve around Sesshomaru being intrigued by Naruto's determination. Sesshomaru decides to train Naruto in some of his own combat techniques, which Naruto adapts to his own fighting style. In return, Naruto shows Sesshomaru the value of friendship and loyalty within a village. This could lead to Sesshomaru having a change of heart about his own solitary ways. Also, they could team up to face a common foe from Sesshomaru's world that has somehow entered the Naruto universe.
Maybe the OC is a scientist who has developed a device that can temporarily steal The Flash's speed. At first, the OC uses it for personal gain, but then realizes the chaos it's causing in the city. They then team up with The Flash to take down other villains who are after the device. Or, the OC could be a meta - human with the ability to see the future in flashes. The Flash initially doesn't trust the OC, but as they start to have the same visions, they have to work together to prevent a major disaster from happening.
A plot could involve the reader being a healer of sorts. Flowey, being curious, approaches the reader. As they interact, the reader starts to show Flowey kindness that he's not used to. This kindness begins to thaw his cold, calculating nature. They could then go on adventures together in the Underground, with Flowey slowly becoming more protective of the reader. Also, the reader could introduce Flowey to new concepts like friendship and self - sacrifice, which would be a huge change for him.