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.
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 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.
Another great one is 'Midoriya and Hatsume's Team - Up'. This story shows how Izuku's hero training and Mei's engineering skills complement each other. They get involved in various challenges where they have to rely on each other, and gradually, a romantic relationship starts to blossom between them.
An ecchi novel typically has characters involved in somewhat risqu茅 interactions or circumstances. It focuses on creating a sense of titillation without going too far into hardcore sexual territory. These novels are popular among certain readers for their light and playful approach to sexuality.
An ecchi manga is a type of Japanese comic that typically contains elements of mild sexual innuendo, fanservice, and often features characters in revealing or suggestive situations without crossing into outright pornography.
An ecchi novel basically has some degree of sexual innuendo or mild sexual themes. It's designed to titillate readers without going too far into hardcore sexual content. These novels are popular among certain audiences who enjoy a bit of spicy but not overly explicit material.
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.
An ecchi novel is basically a type of fiction that contains mild sexual content or suggestive themes. It's not full-on pornographic but has elements that are titillating.