One popular theme is friendship development. Writers often explore how Iida and Todoroki's different personalities interact and how they grow closer as friends.
Fanfiction.net is also a great place to start. There are many different categories and tags. Just type in 'iida x todoroki' in the search bar, and it should show you relevant fanfics. However, the quality may vary, so you might need to read a few to find the really good ones.
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.
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.
Fanfiction.net is another place. It has been around for a long time and has a decent number of 'iida x deku' fanfics. However, the interface might not be as user - friendly as AO3. But it still has some hidden gems if you take the time to search through the relevant sections.
Well, in such a fanfiction, it often explores a different side of Deku being a villain and his relationship with Todoroki. It could be about how their dynamic changes from the original story. Maybe Deku as a villain has different motives and goals that somehow involve Todoroki, like trying to use Todoroki's power for his own evil plans or trying to turn Todoroki to his side.
One great uraraka x iida fanfiction is 'A Helping Hand'. It focuses on how they support each other during a difficult mission at school. The story really shows their unique bond and how they complement each other's strengths.
Another one is 'The Hidden Connection'. In this fanfic, a mysterious event occurs in the school that only Aoyama and Iida seem to be aware of. They have to work together to solve it while keeping it a secret from others. It's full of mystery and some really sweet moments between the two characters as they start to trust each other more and more.
One common theme is friendship. Since they are classmates in the My Hero Academia universe, many fanfics start with them building a strong friendship. For example, they might help each other with training or dealing with personal issues.