There's also 'Inumaki's Unseen Adventures'. This fanfic focuses on the untold stories of Inumaki. It shows his growth as a sorcerer in a unique way, with some really interesting side characters and scenarios that add a lot of depth to the story.
The mystery around his speech. Since Toge Inumaki can only speak in onigiri ingredients, fanfics that try to dig deeper into how he really feels and what he wants to say but can't in the normal way are always interesting. It gives the writer a chance to be really creative in showing his internal dialogue.
The character of Inumaki himself is very appealing. His unique cursed speech ability gives fanfic writers a lot to work with. They can create all kinds of situations where his power is both a strength and a hindrance.
Maki in fanfiction usually has a fierce loyalty to her friends, especially Yuta. She is the type to fight for what she believes in. Yuta is sometimes portrayed as being a bit naive in the ways of the world outside his own small circle, but his pure heart makes him endearing. In many stories, their different personalities create an interesting dynamic, like in a story where Maki's boldness gets them into a risky situation and Yuta's calm thinking gets them out.