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.
Well, in Yumi and Ulrich kiss fanfiction, it often depends on how the author has developed their characters. Some fanfictions might focus on the build - up to the kiss, with lots of tension and unspoken feelings. The kiss could be a long - awaited moment for readers who ship the two characters. It can also be a way to explore different aspects of their personalities, like Ulrich's shyness or Yumi's boldness in that moment.
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.
First, start with their existing personalities. Yumi is often serious and focused, while William can be a bit brash. Have them interact in situations that force them to understand each other better. For example, in a group mission on Lyoko, they might have different ideas on how to approach a problem. By working through these differences, their relationship can start to grow.
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.