Kyudai Garaki/Relationships

All For One
Kyudai first met All For One after he was ostracized from society due to his Quirk Singularity theory. Upon meeting him, Kyudai viewed him as a god incarnate walking among men because of his power and presence. Because he was the only one who believed his theory, Kyudai devoted himself entirely to All For One's cause, giving him his original quirk and working with him for several decades. Kyudai uses his talents as a doctor to help rebuild All For One's body after his battle with All Might. He also creates Nomu and searches for Quirks for All For One to use. All For One is the only one that Kyudai entrusts with his 'children' (Nomu) and the knowledge of his appearance.

Tomura Shigaraki
Kyudai was present when All For One rescued and adopted Tomura as an apprentice. It was he who gave Tomura the amputated hands of his family.

Kyudai does not hesitate to tell Tomura that he is still inexperienced, pointing out he has been spoiled by Kurogiri and that, for all the support he and All For One have given to him, Tomura still hasn't accomplished anything notable. However, out of loyalty to All For One, Kyudai accepts Tomura as the new leader of the League of Villains and admits he is willing to provide his services to him. He is especially impressed by the willingness and desire of Tomura to destroy society.

After Tomura accomplishes his goal, he contacts Kyudai and the doctor notes on how Tomura exceeded his expectations with his regaining his memory, his recent victory and the benefits it acquired, and taming Gigantomachia and agrees to aid him.

Gigantomachia
Kyudai was left in charge of controlling and monitoring Gigantomachia after All For One decided to hide him after foreseeing his inevitable downfall.

Kyudai knows that Gigantomachia is extremely violent and loyal to a fault to All For One, and therefore controls him with recordings of his master's voice on the radio that Gigantomachia carries on his neck. Kyudai at times refers to Gigantomachia as "Machia". Kyudai believes Gigantomachia is useful to Tomura's goals and refuses to lend his full support until Tomura gets Gigantomachia to submit.

Johnny
Kyudai was saddened by Johnny's death and called him a friend. He described Johnny as being curious and complimented him, showing that Kyudai had a sense of kinship with his creations.

Dabi
Kyudai does not meet Dabi until he warps him to his laboratory along with the rest of the League of Villains. Kyudai is impressed by Dabi's keen eyes and ability to discern the difference with the High-End Nomu, and actually goes so far as to enlist his help to test out a High-End Nomu; Dabi is the only member of the League of Villains besides Tomura that Kyudai shows any interest in.