Tamaki Amajiki/Relationships

Mirio Togata
Tamaki has known Mirio since childhood when they first met in the third grade, saying Mirio and him has been friends ever since, and are on a first name basis with each other, indicating a level of closeness. Tamaki's hero name, "Suneater", was also given to him by Mirio.

Tamaki and Mirio first met when Tamaki transferred to Mirio's school, when Mirio asked if Tamaki had been trying to talk about heroes in his stuttered self-introduction, and if so, who his favorite hero happened to be.

Tamaki is thankful that Mirio came to talk to him that school day. Tamaki admires Mirio and sees him as a great person and a brilliant hero, recognizing him as invincible. Tamaki praised the techniques that Mirio achieved from the difficulties he went through and told Eijiro he shines like the sun similarly to Mirio, something Tamaki himself feels a lack of confidence to achieve.

He was surprised at the sight of Mirio's sadden state after learning of Eri's situation, and Mirio, showing visible concern after learning about the injury Tamaki received, asking very swiftly if he was okay.

Mirio also admires Tamaki to some unknown degree, as seen in a flashback, Mirio commented he was able to give it his all because of his presence. This reciprocating admiration and his own admiration for Mirio's personality is a strong motivation for Tamaki to gather his assurance and courage to fight. Mirio also reassures Tamaki when he feels insecure, such as when Tamaki had begun to go a tangent about how the heroes would not be able to save Eri or even themselves, by interjecting his rambling with words of encouragement, both reassuring Tamaki and spurring him into action.

Tamaki worries about what Mirio can do since he knows him perfectly and knows that Mirio can act recklessly. Mirio was the one who gave him the courage and self-confidence necessary to become a hero, since Tamaki always praised his friend's effort and skills, undervaluing himself. Mirio is one of the reasons why Tamaki grew up a hero.

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.

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., and thus appear to be somewhat close.

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 weird, calling it 'chicken-hearted', which becomes her nickname for him.

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.

Fat Gum
Fat Gum asked Tamaki to work in his office and has worked with him ever since. Fat Gum sees a lot of promise in Tamaki praising his abilities above most professional heroes, but he constantly scoffs and demands that Tamaki make some change to his bad mentality.

Tamaki does not like Taishiro's teasing, claiming Taishiro only scouted him to torment him in what Tamaki calls, "workplace harassment."

Since Taishiro is shown to be a man who eats a lot, this seems to complement the requirements of Tamaki's Quirk.

Taishiro seems 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.