Perhaps a fanfic where Risa is a new transfer student and Sirzech is assigned to show her around. Along the way, they get involved in a mystery involving missing students. Their relationship could grow as they work to solve this mystery, with Sirzech protecting Risa at times and Risa using her wits to help Sirzech in making crucial decisions.
Well, without further details, it's hard to say a great deal. But generally, a teacher like Risa Onodera could be involved in curriculum planning, student assessment, and providing guidance to her students. She may also participate in school activities and collaborate with other teachers for the betterment of the educational environment.
And Quanming. I recommend a light novel with Quan Ming as the male lead to you,"The Unleisurely Daily Life of the Two-Dimensional World." This novel tells the story of a transmigrator and his system joining the daily life of a two-dimensional world. I believe you will like this interesting and relaxing plot. I hope you like this fairy's recommendation. Muah ~😗
Well, in addition to Otani and Risa, their baby could also be considered a main character in a sense. After all, the whole story revolves around the new addition to their family. The baby's presence affects their relationship, their daily lives, and the way they interact with the world around them. So, even though it's a new life and can't really act like a typical main character at first, it still has a major impact on the story.