Perhaps the OC is a healer. Shouto gets seriously injured during a battle, and the OC is the one who takes care of him. During his recovery, they have deep conversations, and he realizes how much she means to him. This could lead to a romantic relationship as he recovers and they continue to interact.
One idea could be that the OC is a new student at UA High School. She has a unique quirk that Shouto finds fascinating. They get paired up for a training exercise and gradually start to understand each other better. As they face challenges together, a bond forms between them.
One great 'Todoroki Shouto x Reader Fanfiction' is 'A Flaming Heart'. It has a really engaging plot where the reader character is a new student at UA and gradually forms a deep bond with Todoroki. The way their relationship develops, from initial misunderstandings to a strong connection, is beautifully written.
Characterization is key. Todoroki's complex personality, with his dual quirk and his family issues, should be accurately portrayed. The reader character also needs to be interesting and relatable. They could have their own unique quirk or backstory that ties in with Todoroki's in an interesting way. For instance, if the reader has a water - based quirk, it could contrast with Todoroki's fire side in a way that creates interesting interactions.
Another theme is the development of their relationship against the backdrop of the UA school environment. They are both students there, and a lot of fanfictions show how they interact with classmates while also dealing with their growing feelings for each other. It often involves things like study sessions, training, and school events.
Your fanfiction could start with the OC accidentally stumbling upon Todoroki in a moment of vulnerability. Maybe he's having a flashback about his father. The OC offers comfort, and this starts their relationship. Then, they could be chosen to represent their class in a hero tournament. Working side by side, they face tough opponents and their bond grows stronger. You could also add a sub - plot where other students are jealous of their newfound closeness, creating some interesting drama.
There could be a fanfiction where the Reader is a healer - type quirk user. Todoroki gets seriously injured during a battle, and the Reader is the only one who can save him. After that, Todoroki feels indebted to the Reader and they start spending more time together. This time together leads to them realizing their feelings for each other as they engage in activities like visiting the hospital for Todoroki's follow - up treatments and having conversations about life and heroism.
Power - combined is also a theme. Given their powerful quirks, some fanfictions have them team up and use their powers in unique ways. They discover new abilities when working together, which not only showcases their individual growth but also the strength of their bond.
One plot idea could be that Todoroki is kidnapped by a villain who wants to use his powerful quirk for their own evil plans. His friends then embark on a dangerous rescue mission. Another could be that it was a case of mistaken identity and Todoroki has to figure out how to escape while also dealing with the kidnappers' demands. Or perhaps Todoroki is kidnapped by a group who wants to study his unique genetic makeup related to his quirk.
One popular Shouto Todoroki x Momo fanfiction is 'A New Bond'. It beautifully explores their relationship development as they train together and face various challenges at UA. Another great one is 'Unspoken Feelings' which delves into the unspoken attraction between them and how they gradually come to terms with their emotions.
One idea could be that the OC is a healer who stumbles upon Frankenstein's monster in the woods. The OC decides to help the monster, despite the danger, and they form an unlikely bond. This could lead to a story of redemption for the monster and a journey of self - discovery for the OC.
Maybe the OC is a scientist who has developed a device that can temporarily steal The Flash's speed. At first, the OC uses it for personal gain, but then realizes the chaos it's causing in the city. They then team up with The Flash to take down other villains who are after the device. Or, the OC could be a meta - human with the ability to see the future in flashes. The Flash initially doesn't trust the OC, but as they start to have the same visions, they have to work together to prevent a major disaster from happening.