Shoto Todoroki/Relationships

Endeavor
Flame Hero Endeavor is Shouto's father. Shouto's relationship with his father is on negative terms as Endeavor only sees Shouto as a tool for surpassing All Might; Shouto despises his father for seeing him as nothing more than a tool and hates him for his abuse against him and his mother.

At a very young age, Endeavor began training Shouto but the training was harsh and detestable. This was where Shouto began to dislike his father, telling his mother that he never wanted to become a Hero like him. Shouto's resentment of his father only further increased when he started to abuse his mother as well as prevent him from interacting with his brothers. After Endeavor sent his mother to the hospital, Shouto snapped and outright said to his father that he hates him, blaming him for everything that has happened.

Although Shouto hates his father for his lousy personality and what he did throughout his childhood, Shouto does not entirely despise his father as he acknowledges his father's intelligence, judgement, and insight.

Shouto's Mother
Unlike his father, Shouto's mother was kind, caring and loving towards Shouto and in return Shouto loved her deeply.

Shouto hated his father for always abusing his mother. When Endeavor began to train Shouto which was harsh and detestable when he was five, Shouto's mother intervened, trying to stop Endeavor's mad training methods but only to fail. Shouto's mother supported Shouto in these dark times, saying to him that its okay to become a hero, telling him that he is not a slave to his bloodline and that he can become whatever he wants to be.

However, Shouto's mother soon became insane from all the abuse by Endeavor and started to hate him as well as Shouto's left side. She finally snapped and threw boiling water over Shouto's face, causing a burn over his left eye. However, Shouto bore no ill will against his mother for this incident and showed no hatred for her. Instead, Shouto asked where his mother was and became shocked that she was admitted to the hospital, starting to cry and blamed his father for what happened to her.

Even after everything that happened in the past, Shouto still loves his mother. Shouto met with his mother after the Sports Festival and she reconciled with her son. Thus, Shouto's relationship with his mother has returned to what it was in the past; a loving relationship between mother and son. Thanks to reconciling with his mother, Shouto has come to terms with using his Fire power.

Izuku Midoriya
Shouto saw Izuku as his arch rival due to him having connections with All Might (a person whom his father has a rivalry with). Shouto's interactions with Izuku were of a serious nature but not to the point of antagonistic; after Stain's defeat, though, Shouto becomes friendlier with Izuku. After Izuku made him use his fire power during the Human Cavalry Battle, Shouto started to take Izuku seriously, going so far as telling Izuku his backstory and declaring to him that he would surpass him using only his ice powers and in the process disown his father. Izuku has a lot of respect for Shouto, admitting that he is far stronger than him. Although Izuku wants to defeat Shouto, Izuku started to show sympathy for Shouto after seeing his sadness and resolved to help him. During the final clash in their battle, Shouto thanked Izuku. After his fight with Izuku, Shouto has begun to acknowledge Izuku's prowess, noting that he is a person compelled to help people no matter what.

In the Field Training Arc, when Izuku sends out a message for emergency back-up, Shouto is the first and only to arrive, telling his father that his friend needed his help, making it apparent that he views Izuku as a friend now.

Katsuki Bakugou
Shouto and Katsuki have interacted a few times such as in the Obstacle Race during the Sports Festival where they had a brief scuffle for first place and before they faced each other in the final match of the Sports Festival's tournament event. Shouto appears to not be fond of Katsuki's aggressive personality and doesn't seem to see Katsuki as a rival. On the other hand, Katsuki was shown to be envious of Shouto's strength after seeing him in the Battle Trial. However, Katsuki dislikes Shouto's cold attitude. Unlike Izuku, Katsuki doesn't care about Shouto's problems or feelings. It seems that by the end of the first semester, Shouto and Katsuki appear to be neutral with each other, enough for them to have limited social interactions with each other without hostility as shown when they joked to each other about Kouta reminding them of people they knew.

Tenya Iida
Shouto appears to be on good terms with Tenya, respecting Tenya for his incredible speed after their battle in the Sports Festival; Tenya appears to also respect Shouto for having the behavior of a true Hero. They are first seen interacting each other when Shouto chose Tenya to join Shouto's team in the Cavalry Battle. After the Sports Festival, Shouto becomes increasingly worried about Tenya's mental health when he heard about Tensei Iida's injuries from Stain. Shouto understood Tenya's hatred for Stain fully well as he too knows the feeling of hating someone and thus could relate to him, deciding to help Tenya overcome his bitterness such as encouraging Tenya to become the man he wants to be.

Momo Yaoyorozu
Although their interactions have been minimal, Momo and Shouto are friendly towards each other. Shouto has many similarities to Momo; they both are students who got into Yuuei through scholarships, hail from famous Hero families and have powerful Quirks. Momo always compared herself to Shouto and concluded that he is a step ahead of her; as a result, she doesn't have confidence in herself. However, this also caused her to admire Shouto for having brimming self-confidence. Shouto has respect for Momo as he voted for her during the Class President election, being one of the only two people to vote for her; Shouto even told Momo he believed that she excelled at the role of being a leader.

Shouto chose her for the Human Cavalry Battle in the Sports Festival. During the practical end of term test, Momo is paired with Shouto. After being captured by Shouta, Shouto encouraged Momo to believe in herself. This inspired Momo and gave her the confidence needed to outwit Shouta which allowed her to free Shouto.

Stain
Shouto was disgusted with Stain's ideals of killing "fake" Pro Heroes in order to achieve justice, going so far as to tell Tenya to pay no heed to him. Stain appears to respect Shouto's strength.