Fuyumi Todoroki/Relationships

Enji Todoroki
When she was born, Endeavor was mildly disappointed she only inherited her mother's Quirk, but was content with her and Toya at the time. As with her brothers Toya and Natsuo however, Endeavor ended up neglecting her during her childhood and didn't want to make her his successor.

Despite this, Fuyumi is the only child who is mostly able to look past their father's faults and forgive him for his previous behavior, especially since her father is trying to atone for his mistakes and be a better person. Fuyumi is more than aware of how messed up her family turned out because of Endeavor's abuse, and while she expresses some fear of him, she is nonetheless the one who supports Enji the most in his effort to improve and fix his family issues. She was surprised to hear that he regularly visits her mother and listened when he voiced his inner troubles. She was even horrified to watch the report of Hood defeating him but cheered on his persistence.

Following Endeavor's battle against Hood, Fuyumi prepares dinner with her brothers, hoping for a chance for them all to start a dialogue. Things do not end too well however due to Natsuo's animosity towards Enji, causing the former to soon storm out. Fuyumi told Shoto that she was quite hopeful and proactive with getting her father and siblings to mend relations with each other due to his recent progress, hoping their family could finally be together and happy again.

Fuyumi's more positive opinion of her father is likely due to the fact that she still remembers his more positive side during her early childhood. In the early years of her family, prior to Natsuo and Shoto's births, her father had a healthier relationship with his wife and children, a time when the Todoroki family was happy and stable.

She tries again months later with another family dinner, in which she also invites Izuku and Katsuki, although the outcome was not much better. Fuyumi confided in Shoto that she too feels some resentment towards Endeavor but wants to move past it for the sake of their family.

Although her initiatives have not yet been very successful, Enji thanks his daughter for all the support she has given him, thinking that Fuyumi doesn't know how much she has saved him.

When he leaves with the boys, he once again thanks Fuyumi for her actions who only responds to his gratitude with a smile. Endeavor later revealed that he is building a new house for the siblings and their mother, while he remains at their house alone.

When visiting her father at the hospital after her older brother's broadcast, Fuyumi was concerned and asked her father why he was crying. She was taken aback by his apologizing. After reminiscing of Toya and the events that made him become a villain, Fuyumi stated that she had a role in Toya's descent into villainy because of her fear at not saying anything. She offers to be there with the rest of the family to help her father stop Dabi.

During Toya's rampage, Fuyumi came to help her father, despite suffering several burns. After Shoto was able to stop Toya, Endeavor proceeded to apologize to her for putting so much work on her shoulders.

Rei Todoroki
In the past, Fuyumi was shown to have a positive relationship with her mother, happily interacting with her and giving her a flower when she was a child. Likewise, while Enji still desired a worthy heir, Rei genuinely wanted another child after Toya was born, believing the siblings could encourage each other, ultimately leading to Fuyumi's birth.

While Fuyumi was in middle school, she witnessed her mother trying to reason with Enji and defend Shoto from the former's training, but was too afraid to try and help her.

Like her brothers Natsuo and Shoto, Fuyumi visits her mother for time to time at the hospital. Fuyumi cares for her mother's physical condition, as seen when she brought her a set of warmer clothes, but especially emotionally, reprimanding her brother Natsuo for mentioning her father in front of her, even when they had agreed not to.

In spite of the latter, she was surprised to learn that her father had visited Rei several times, although they did not see each other face to face due to Rei's current condition, as she still fears him.

Toya Todoroki
From the little that is known of her relationship with Toya, Fuyumi seemed to have a good relationship with him when they were kids, as they used to play together. She also attempted to stop from his reckless training because he often got burned but he would shrug off her concern.

Nowadays, Fuyumi mourns his "death" and she prays at his altar. Unlike Natsuo, she does not seem to blame their father for his death.

When Dabi revealed himself in public in an attempt to attack Endeavor and Hawks, Fuyumi appeared greatly shocked by this despite not knowing his true identity during the time. When Dabi revealed his true identity as Toya during the Paranormal Liberation War, Fuyumi was greatly shocked and saddened to learn that her older brother had become a villain and mass murderer.

During the Final War, Fuyumi is reunited with him after a decade and didn't hesitate to rush towards the battle between both her father and her brother, despite knowing that it's dangerous. She then proceeds to reason with the latter, telling him to stop, for she couldn't bare to lose anyone again.

Natsuo Todoroki
Fuyumi has a good relationship with her younger brother Natsuo, and as with Toya, they usually played together as kids. The pair still get along in their older years, with Fuyumi teasing him during their visit with their mother, much to his dismay.

However, unlike him, Fuyumi is able to look past their father's faults. She also wishes for him to see that she is trying so hard to fix the family that Endeavor broke, and that everyone can live together as a real and normal family. While Natsuo doesn't agree, for Fuyumi's sake, he is willing to begrudgingly participate when which his father is present, to respect the feelings of his sister, although this inevitably generates tension and Natsuo usually leaves to avoid more problems.

She also expressed concern for him after he was attacked by a villain, to which Natsuo assured her that he was fine.

Shoto Todoroki
During their childhoods, Shoto was separated from Fuyumi while growing up so Enji could focus on training him. Fuyumi witnessed the harsh abuse Shoto suffered at the hands of their father but could not bring herself to intervene. To this day, Fuyumi still feels guilty over not being able to help Shoto, something that inspired her to become a teacher.

Following Rei's hospitalization and when Enji finally allowed the siblings to interact, Fuyumi took on a caring role over Shoto and made sure he was looked after.

After the U.A. Sports Festival, Fuyumi was surprised when Shoto left to visit their mother at the hospital, asking if it was okay without saying anything to their father, though Shoto left regardless.

When he arrived home late after the Kamino Incident, she scolded him because of the dangers of him going out and directed him to their raging father.

During the Pro Hero Arc, she spent time with him and Natsuo before they watched as the latter told off their father for his previous treatment of him and his siblings. Fuyumi became upset, telling Shoto her desire of being a real family, something he sympathized with. Fuyumi watched him express a similar desire to see the kind of man Endeavor will be.

Fuyumi is aware of the difficulties that Shoto has in relating to other people, so she is glad to know that his brother has friends in U.A. High School. During the Endeavor Agency Arc, she decides to invite everyone to a dinner to meet them. After a dinner, she once again confided in him after the dinner was turbulent. Shoto was grateful to her for her intentions.

During the Final War Arc, Shoto saves her and the rest of the family from Toya's destructive rampage.

Izuku Midoriya & Katsuki Bakugo
Eager to meet Shoto's friends, Fuyumi invited Izuku and Katsuki to dinner at the Todoroki Abode with her family. The whole time, she was kind to them and both boys praised her cooking skills. However, dinner does not end as she would have liked due to the tension between her brother Natsuo and her father Enji.

While talking with his brother Shoto about the matter, she is criticized by Katsuki for talking about their family drama in front of them, for it was ruining the evening, to which she apologizes. Izuku voices his thoughts that Shoto is a very kind person and is waiting for the right moment to forgive his father.

After dinner, Fuyumi says goodbye to them and she thanks Izuku for being Shoto's friend. Fuyumi also agrees to send Katsuki her recipe for mapo tofu.