One idea could be a story where Fem Todoroki has to overcome her self - doubts while training in a new and challenging environment. Maybe she's sent on a special mission with a group of heroes she doesn't know well, and she has to prove herself.
Another concept is that Todoroki was turned into a vampire by a villain's quirk gone wrong. He then has to find a way to reverse it. He teams up with Midoriya, who is determined to help his friend. They search for a mysterious old hero who might know a cure, all while Todoroki battles his inner vampire nature.
A fanfic could be set during a school festival. Momo is in charge of one of the booths and Todoroki volunteers to help her. They have to deal with various problems like running out of supplies. Momo creates new items with her quirk while Todoroki helps with keeping things cool (literally with his ice) or heating up things when needed. In the process, they share some personal stories and get closer, realizing they have more in common than they thought.
One way is to have an open and honest conversation with the host family during the interview process. Au pairs can ask about the family's expectations and also share their own. And during the stay, if something is wrong, don't be afraid to speak up or seek help from the au pair agency. Au pairs should also trust their instincts. If something seems off during the initial contact with the family, it might be a sign to look for another opportunity.
If the grandfather is very warm and accepting, Shikaneji would feel relieved and happy. They might open up more about their relationship and their dreams. Nejire could start chatting excitedly about their future together, and Shinsou would relax and join in the conversation more. However, if the grandfather is not so friendly, they would be disappointed and perhaps a bit defensive.
There's also 'Growth Together'. This fanfic shows how Deku and Todoroki support each other during tough times at UA. They face challenges not only from villains but also from within the school. Their relationship develops as they help each other overcome these obstacles.
Well, Wattpad could be a place to search for My Hero Academia Depressed Todoroki fanfiction. A lot of fans post their works there. Just type in the relevant keywords and browse through the results. You can also join some My Hero Academia fan groups on social media platforms like Facebook or Reddit. Fans in those groups often share and discuss interesting fanfictions, and they might be able to point you in the right direction for the ones about a depressed Todoroki.
One possible fanfiction could be about Momo and Todoroki teaming up for a special mission. They use their unique quirks in unison to defeat a powerful villain. Momo creates useful items and Todoroki controls the temperature to their advantage.
Midoriya's friends like Uraraka and Iida would be extremely worried. They would immediately start looking for him. Uraraka might use her quirk to search in the air, while Iida would lead the ground search with his speed. Bakugo, on the other hand, would be furious. He would probably go on a solo mission to find Deku and take on Todoroki without hesitation.
One host family had an au pair from France. The au pair was really into cooking. She would often make delicious French pastries for the family. The kids in the family loved her for it and they all learned a bit of French while she was there. It was a great cultural exchange experience for both the au pair and the family.