A third storyline could be a sports - related one. They all join a basketball team. Takemichi is the underdog trying to prove himself, Mikey has natural talent but is a bit of a wild card, and Draken is the reliable team captain. They face off against tough opponents, and there are internal team conflicts as well. But in the end, they learn to work together and become a great team.
To write a compelling character interaction, start with understanding their personalities. Takemichi is often determined but a bit clumsy at times. Mikey is strong - willed and has a natural leadership quality, and Draken is the loyal and protective type. So, when writing their interactions, you can show how Takemichi's clumsiness might make Mikey laugh or roll his eyes, while Draken would be there to support Takemichi. For example, if they are in a fight, Takemichi might accidentally trip over his own feet, Mikey would be like 'Seriously, Takemichi?' and Draken would quickly pull Takemichi back to safety.
In Takemichi x Mikey fanfiction, a common theme could be their growth together. Takemichi's time - leaping ability can create really interesting storylines in relation to Mikey. For example, Takemichi might use his power to save Mikey from a dark future, and in the process, their relationship evolves. It's also possible that the fanfiction shows their shared dreams and how they strive to achieve them side by side.
The popularity also stems from the fans' love for the Tokyo Revengers world in general. Since Takemichi and Mikey are central characters, fans are eager to explore their relationship further. Fanfiction allows them to do that, whether it's imagining different timelines, different interactions, or just exploring their emotional connection on a deeper level.
Some characters might become more protective of Takemichi if the fanfiction shows him in a difficult situation. They would feel a stronger bond towards him, wanting to ensure his safety. However, if the fanfiction distorts Takemichi's character too much, it could cause some confusion and even a bit of a rift. They might start to question if they really know Takemichi as well as they thought.