Tamaki Amajiki/Relationships

Mirio Togata
Mirio and Tamaki are childhood friends and have spent most of their lives together, inspiring and supporting each other. Mirio is one of the reasons why Tamaki grew up a hero and they both have a strong bond and refer to each other by their first name, which indicates their level of closeness and respect. Also self they take care and worry when one of them goes through dangerous or emotionally stressful situations, even going so far as to determine what the other would do in a situation and how they would act.

They met when Tamaki transferred to Mirio's school in third grade. Tamaki was unable to insert himself into any group due to considering himself a boring person, but Mirio came over to talk to him and asked if Tamaki had been trying to talk about heroes in his presentation and if so who his favorite hero was. It was this recognition that began the friendship between Tamaki and Mirio.

Tamaki is thankful that Mirio came to talk to him that school day and one day in high school, they were both walking home and Tamaki told Mirio that he was amazing and began to praise Mirio's optimism while lamenting his own lack of self esteem, telling him that he would become a Hero like the sun. Mirio interrupted Tamaki and told him that he could give it his all because he was by his side. Mirio encouraged Tamaki by telling him that he admired him because despite his insecurity and anxiety never ran away and inspired him to do the same, thinking that he needs to work harder to never lose to him.

Mirio continued to praise Tamaki and told him that he has amazing power and that although he had a low opinion of himself, he always thought of him as a cheerful and funny boy who is someone even more amazing than the sun. It is highly implied that after that conversation, Mirio may have given Tamaki his hero name, Suneater. Tamaki idolizes Mirio's outgoing personality and tenacity to stay motivated and keep his head balanced, something Tamaki believes he does not possess and it is often seen of Tamaki referring to Mirio as the sun, as in his eyes, Mirio shines bright like the sun because of his bright and positive personality. Mirio, on the other hand, says Tamaki shines even brighter than the sun itself, thus overshadowing it.

During Mirio's fight against Class 1-A, Tamaki is in a corner thinking how inexperienced the students are for not acknowledging all the hard work Mirio needed to refine and master his Quirk, commenting that Mirio has always been strong since he was a child but that he needs to learn to contain himself. At Sir Nighteye's meeting, Mirio showed visible concern when she learned that Tamaki had been attacked and quickly asked if she was okay. Tamaki was surprised to see Mirio so depressed after the meeting, being the first time he had seen him so depressed and asked him to raise his head. Tamaki smiled happy after watching Mirio regain her cheerful and energetic personality.

As Eri's rescue mission begins, Tamaki had begun to go a tangent about how the heroes would not be able to save Eri or even themselves and Mirio got in the way of his ramblings with words of encouragement, both to reassure Tamaki and to encourage him to action, telling him that that will not happen and that he is Suneater. When Tamaki decides to stay behind to fight three members of the Eight Bullets, he asked Izuku to take over for Mirio because he could act recklessly and he knows he is going to try too hard. During Tamaki's fight, he remembers his past with Mirio and the words he said to her back then, giving him enough motivation and strength to keep fighting and to win.

When Mirio got shot by Shin Nemoto during his fight against Overhaul with the Quirk-Destroying Drug bullet, Tamaki woke himself up out of unconsciousness and felt something bad happen to Mirio. It is implied that right after that, Tamaki went to search for him, and finally carried Mirio out of the building.

At some point before the operation against the Shie Hassaikai, Fat Gum joked with Tamaki after he mentioned that he had never had a fight or argument with Mirio for as long as he’s known him, which claims the two were never on bad terms.

When bringing up the topic of Eri's Quirk, Tamaki placed his hand on Mirio and mentioned Mirio's Quirk possibly returning and said his future of a great hero might be real. Mirio thanked him for his belief and smiled at his friend.

Nejire Hado
While they are not on a first name basis, the two have known each other during their time at U.A. Tamaki treats Nejire's talkative attitude casually with tolerance and would attempt to keep that personality of hers in check when required. Nejire finds Tamaki's anxious personality silly, calling it 'kitten-hearted', which becomes her nickname for him, indicating she likes to tease him. Despite their opposing personalities, they have become good friends and are seen around each other a lot. Tamaki also helps her prepare for the pageant. Tamaki also seems to have a sense of appreciation and admiration for her as during her pageant performance, he compared her to an innocent fairy.

Eijiro Kirishima
Tamaki was initially somewhat annoyed by Eijiro's optimism and said that it was terrifying, but at the same time congratulated him on it, and then compared him to Mirio. Eijiro shows that he has a lot of respect for him, as he is seen praising his abilities multiple times and refused to let go of the criminal who had previously shot him. Eijiro is also grateful to Tamaki because it was thanks to him that he was able to join the Fat Gum team.

Later in the operation to save Eri, Eijiro became concerned for Tamaki again when he was left behind to fight only three members of the Yakuza, but after hearing Fat Gum's words, Eijiro expressed his confidence in Tamaki's abilities to beat the three enemies.

At some point before the operation, Tamaki and Eijiro patrolled near a food stall together and they talked about relationships with their friends. Fat Gum learns that a suspicious villain was hovering near a festival and asked Tamaki and Eijiro to infiltrate the festival to catch him. After catching the Villain, they continued patrolling together.

Izuku Midoriya
Tamaki hasn't interacted with Izuku as much, but they seem to be on good terms. When Mirio challenges the Class 1-A students to a fight, Tamaki is in a corner watching the fight and hears Izuku gathering some of his classmates to strategize against Mirio. During the operation against the Shie Hassaikai, Izuku was shocked when Tamaki wanted to stay behind to fight three of the eight bullets and Tamaki asked Izuku to take care of Mirio because he could act recklessly.

During a training exercise in which Tamaki acted as a villain against Class 1-A, Izuku despite having the opportunity to hit Tamaki and knowing that he was only acting like a villain, refused to hit him and restrained him instead, asking him to surrender. When Tamaki asked Izuku why he didn't hit him, Izuku replies that he didn't want to hurt him.

Fat Gum
Sometime, Fat Gum employed Tamaki for his internship and has since worked together with him. The relationship between the two can be deemed as friendly, though Tamaki seems to perceive their work relationship a little more negatively, particularly when they discuss his fragile mentality.

As he has worked with Tamaki personally, Fat Gum sees great potential in Tamaki, praising his abilities to be above most professional heroes, although he constantly scoffs and demands that Tamaki make some change with his petty mentality.

Tamaki dislikes Fat Gum's teasing, claiming that Fat Gum only sought him out to torment him to what Tamaki calls "workplace harassment" in the workplace, but Fat Gum also understands Tamaki's flaws and weaknesses and is shown to be worries about him when placed under a lot of pressure. However, he proves to trust him despite his doubts, since he allowed him to face three villains on his own.

Since Fat Gum is shown to be a man who eats a lot, this seems to complement the requirements of Tamaki's Quirk and it seems that Fat Gum to be or considers to be close to Tamaki, as he is the second person to refer to him by his first name, something that only Mirio did.