Todoroki's character development in time travel fanfictions can be quite profound. He may start as a somewhat aloof character, but through time travel, he begins to understand the importance of relationships more deeply. When he travels back and witnesses the relationships he could have had or lost, it makes him cherish the ones he has in his original timeline. His view of heroism also evolves. He realizes that being a hero isn't just about using his powers but also about making the right choices at the right time, which is especially highlighted when he has to make decisions that could change entire timelines.
In the fanfiction, their relationship could start with a bit of competition. Both are ambitious to be heroes. However, they soon realize that they can achieve more by working together. As kids, they might compete in small challenges like who can run faster or jump higher using their quirks (or in Izuku's case, his physical training). This healthy competition could fuel their growth and transform into a deep - rooted friendship that withstands all the difficulties they face later in their hero careers.
You can make the characters more interesting by exploring their backstories in relation to Todoroki's birthday. Maybe a character had a similar experience on their own birthday that makes them connect with Todoroki on a deeper level. Also, show different sides of the characters. For instance, Uraraka could be the one who comes up with the most creative birthday gift idea, showing her creativity and thoughtfulness towards Todoroki.
Todoroki can start by simply being there for Deku. Just sitting with him in silence when Deku doesn't feel like talking. It shows that he's not alone. Also, Todoroki can share his own struggles. Since he has his own complex family situation, he can relate to feeling down sometimes. This can make Deku feel that his problems are not unique and that it's okay to not be okay.
First, understand the characters well. Todoroki has a complex personality with his ice - fire quirk and his family background. The reader character should also have a distinct personality. For example, if the reader is supposed to be a strong - willed character, show it through their actions and decisions. Second, build the relationship gradually. Don't rush into love at first sight. Maybe start with a shared interest or a common goal. Third, use vivid descriptions. Describe Todoroki's powers in a way that makes them exciting, like how the ice forms on his fingertips or the heat of his fire side. This will make the story more immersive.
His friends would probably take care of him. Midoriya would be very eager to help, using his kind-hearted nature. He would make sure Todoroki is fed and comfortable.
One idea could be that all his friends at UA plan a surprise birthday party for him. They decorate the common room with his favorite colors, blue and red. Another plot could be Todoroki spending his birthday with his family, trying to reconcile with his father on this special day. Maybe he receives a heartfelt gift from his mother that has a deep emotional significance.
In a fanfic, crossdressing Todoroki can also develop his relationships. His friends' reactions to his new look can range from shock to acceptance. This can strengthen his bonds with those who are supportive and teach him about the true nature of friendship. It can also be a catalyst for him to stand up for himself and others who may be judged based on appearance, thus making him a more well - rounded character.
The story could end well if Todoroki is successfully rescued by his friends. They could have a big celebration and Todoroki could thank them for their efforts. He might also grow stronger from the experience, both in his quirk control and in his relationships with his friends.