How about 'Mei Hatsume and Izuku Midoriya: An Unlikely Bond'? This title gives the idea that they might have a connection that is not expected at first, which can be a great hook for a fanfic.
Another theme is the support they give each other in their respective goals. Hatsume with her inventions and Iida with his hero training. In many fanfictions, they help each other grow, for example, Hatsume might come up with a gadget that helps Iida in his combat training, and Iida might give Hatsume some advice on how to present her inventions better.
In deku x hatsume fanfiction, a frequent theme is the power of teamwork. Since Hatsume is great at inventing and Deku is a determined hero - in - training, they often team up. This teamwork is not just about fighting villains but also about achieving goals in the hero academy. Also, the theme of friendship - turned - love can be seen. They start as friends or classmates, and as they spend more time together, their relationship deepens into something more romantic.
There might be a fanfiction where Hatsume participates in a hero competition. It could show her using her inventing skills in unexpected ways to overcome the challenges of the competition. She might modify her existing inventions on the fly to gain an edge over the other competitors.
One popular iida x hatsume fanfiction is 'The Invention of Love'. It shows their relationship developing as they work on projects together in the hero academy. Hatsume's wild inventions and Iida's strict sense of order create an interesting dynamic.
There are quite a few deku x hatsume fanfictions out there. For example, 'Hatsume's Helper - Deku'. In this one, Deku becomes an essential part of Hatsume's workshop, and they start to develop feelings for each other through their daily interactions. Also, 'Deku's Encounter with Hatsume's Genius' is a story that delves into how Deku first discovers Hatsume's amazing inventing skills and how that draws them closer.
A common theme is innovation. Since Mei is all about inventing and Izuku is constantly looking for ways to improve his hero abilities, fanfics often center around their combined efforts in creating new things. For example, Mei might create a new type of support item for Izuku's quirk.
A common theme is their shared passion for heroics and invention. They both have a drive to make a difference in the hero world, and fanfictions often explore how they combine their skills. Another theme is friendship. Since they are classmates, many stories show them becoming good friends and relying on each other.
A good plot could be that Izuku is in need of some new gear for his hero work. He goes to Mei Hatsume for help. Mei is excited to create something unique for him. As they work together on the gear, they start to understand each other better and form a friendship that eventually turns into something more. They also face challenges like time constraints and other people trying to steal Mei's ideas for the gear.
Some dedicated 'My Hero Academia' fan communities on social media platforms like Reddit or Tumblr might also recommend good Hatsume fanfictions. People in these communities often share their favorite stories and discuss different aspects of the fanfiction world.