The plot might revolve around Iida reflecting on his past year on his birthday. He could be thinking about his achievements and failures, especially in his journey to become a great hero. Meanwhile, his classmates could be preparing a special gift for him, something that has a deep meaning related to his hero persona, like a customized piece of hero gear.
I'm not sure if there are specific light novels solely dedicated to Iida Tenya's birthday. However, in the 'My Hero Academia' universe where Iida Tenya exists, there are many general light novels that might touch on his character development and events related to him. You could start by checking official 'My Hero Academia' light novel collections in your local bookstore or online platforms.
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.
One common theme is the conflict between their different ideologies. Stain has his extreme views on heroes, while Iida has a more traditional heroic view. This contrast often creates an interesting dynamic in the stories.
One common theme is friendship development. Since they are classmates in the My Hero Academia universe, many fanfictions explore how their initial acquaintance turns into a deep friendship. For example, they might start off just as study partners and gradually become more like siblings who support each other no matter what.
Well, it could be that Stain kidnaps Iida to use him as a bargaining chip against other heroes. He might think that by having Iida in his custody, he can make demands on the hero community, like asking for changes in how heroes operate or for certain heroes to be punished. Another possibility is that Stain wants to prove a point to Iida about the flaws in the hero system. He may hold Iida captive and show him examples of what he believes are the wrongdoings of heroes, trying to sway Iida's loyalty from the hero side to his own view of justice.
Some fanfictions explore Tenya's insecurities. Despite his confident exterior, he may have doubts about himself. Writers might write about how he deals with these feelings, especially in relation to his peers who also have amazing powers. And of course, there are fics that revolve around his role in team - based hero work, highlighting his leadership skills and how he coordinates with his teammates.
One popular theme is friendship development. Writers often explore how Iida and Todoroki's different personalities interact and how they grow closer as friends.
One popular aoyama x iida fanfic is 'The Unlikely Bond'. It beautifully explores their relationship in the context of their different personalities within the My Hero Academia universe.
A popular one is 'Growth Together'. In this fanfic, they both face challenges that test not only their individual growth but also their bond as friends. It's well - written with great character development for both Iida and Deku.