Yuga Aoyama/Relationships

Unnamed parents
Yuga appears to have an excellent relationship with his parents. When he was younger, they wanted to ensure that he would not be shunned for being Quirkless. To that end they managed to contact All For One and made a deal with him to give their son a Quirk.

As it turns out, the Quirk that Yuga received was a poor fit for his body, causing his Navel Laser to leak out involuntarily. His parents would then order and gift Yuga with a support belt built specially for him, allowing him to use his Quirk to a better capacity. With their son now having a Quirk and being able to pursue his dream of becoming a Hero, the Aoyama family lived happily until All For One came to collect on his debt.

After this, All For One would have Yuga become his mole within U.A. High School, threatening him and his parents with death should they disobey or lie to him. Upon Izuku returning to U.A., and All For One ordering Yuga to lure him somewhere alone, his parents begged their son to follow the villain's orders in fear for all their lives. Despite this, his parents have expressed great remorse for putting him in jeopardy and at one point begged for their son’s forgiveness when they saw how taxing it was on him. In return, Yuga tearfully voiced how he only wanted to keep them safe from All For One.

After their deception was discovered by Izuku and Toru, his parents immediately sought to protect him from the repercussions. They also took full responsibility to his class and the authorities by stating that their son was innocent in all of this.

Class 1-A
They are all his classmates and several of them are put off or disgusted by his arrogant attitude. Regardless, he gets along well with them. At times there are moments when he is encouraged to take action to protect them such as when he intervened to save Fumikage Tokoyami and Katsuki Bakugo from the League of Villains or when he helped in the Provisional Hero License Exam.

They were greatly shocked and hurt to discover that he was a traitor. Mashirao Ojiro and Toru Hagakure questioned Yuga on his audacity to attend classes with and live under the same roof as them. Overcome with guilt, Yuga revealed how he enjoyed the fun times he had with them and how it wounded him to plot against them. Furthermore, he expressed towards his parents that he thought he was finally free when All For One was defeated by All Might and believed that he could become true friends with his classmates, showing how he truly came to care for them.

Yuga becomes further emotional upon seeing that his classmates wish to forgive him. He also reveals that the more faith they have in him, the less belief he has in himself and that he immensely fears making the same mistake all over again.

Mina Ashido
Yuga seems to interact with her more than with his other classmates. She often teases him about his stomach aches as a result of his Quirk. During the Battle Trial, the two were teamed up together and Mina accidentally dripped her acid on Yuga’s cape, burning it, which he dreadfully recalls despite her apologizing. Mina also managed to defeat him with ease during the U.A. Sports Festival. However, she did look apologetic when she saw him dazed from her punching and knocking him out.

A running gag is her interrupting him when he is arrogantly speaking about himself, often making him mad.

She was deeply shocked to discover he and his family were spies for All For One. She was seen crying while he was interrogated for his betrayal.

Ochaco Uraraka
They are classmates and their first meeting was in the Quirk Apprehension Test. When Izuku has his Quirk restrained by their teacher, Yuga gives Ochaco comforting words by stating he'll be by her side if Izuku is expelled as she is confused and can't recall his name.

They are later paired up against Thirteen and their teamwork is a bit rocky. When they were in a bind, Yuga had correctly guessed that Ochaco was thinking of Izuku in their match. He inquired if she had feelings for him, which resulting in her blushing and letting go of the rail she was clinging to. However, this also awakened her combat instincts and allowed her to take down the hero.

Yuga's words caused Ochaco to ponder over her feelings for Izuku and they were shown to stick with her before she realized that he was right about what she felt about Izuku.

She was deeply shocked to discover he and his family were spies for All For One. She was visibly sad and upset upon seeing him being interrogated for his betrayal.

Izuku Midoriya
The two first met at the entrance exams where Yuga saved Izuku from being attacked by a robot, though he did this for points as he remarked that the latter made good bait and he would most likely not see him again. Izuku later excelled in the exams and became classmates with Yuga. It was shown his opinion hadn't changed, as he remarked on Izuku's lack of skill to Ochaco. However, Izuku surprised him with his powerful Quirk which allowed him to remain in the school.

After this, the two had no further interaction that was notable until the Remedial Course Arc. Yuga would act strangely around Izuku who would note that he could never get a good read off the latter.

Izuku is later scared when Yuga spies on him as he slept and left a message (in cheese) to say he knows Izuku's secret, which left Izuku wondering if Yuga is aware of One For All. In training, Izuku is called out to by Yuga and is shown one of his new moves though it causes him severe stomach problems. Seeing him in this state, Izuku took Yuga away to recuperate before he asks him what he meant in his message.

Yuga explained that he is aware of Izuku not being accustomed to his Quirk and reveals that he went through a similar experience and compared his powers leaking out in his childhood out to Izuku's initial lack of control of his own Quirk before they both overcame it. He then tells Izuku that he is not alone in hardships, as it is better to face them together or they won't excel. His words relieve and cause Izuku to smile and thank him for his support. After a few days, Izuku and Yuga became good friends with some of the class noting their frequent interaction.

After the Paranormal Liberation War, he was stunned to discover from Toru Hagakure that Yuga was the traitor who had been aiding All For One. When confronting him, Yuga admitted with great remorse that this was true.

Yuga told Izuku when he discovered he was Quirkless too, that he fell into despair because Izuku used his gifts for heroism while Yuga betrayed his dreams. Izuku reluctantly detained Yuga and his parents after a failed attack and escape. Unlike the rest of the class, Izuku understood that Yuga did what he did to protect his family. He also saw that in spite of being stationed as a spy that he went against his orders by trying to save Katsuki and Fumikage during the Summer Training Camp attack, and bringing up how he did not have any ill intentions towards them. He then demanded that Yuga take his hand, saying that he could still be a hero despite what had happened. Yuga is tearfully moved and taken aback by Izuku’s empathy towards him, despite his betrayal.

Yuga would live up to the faith Izuku had in him by aiding him in luring All For One and the rest of the Paranormal Liberation Front out under the pretense of having betrayed him once again by luring him out for All For One to confront.

Tenya Ida
The two of them have had very little interactions in general. However, during the Provisional Hero License Exam, they came across one another. Yuga was inspired by Tenya's words and his desire to fulfill his ultimate dream, so-much-so that he willingly shot a beacon to draw other contestants near to serve as a distraction while Tenya sneaks up on the other contestants. Yuga openly expresses the impact Tenya's words had on him and also opens up on his desire to be an equal to his classmates, demonstrating the respect Yuga gained for Tenya and how he was willing to open himself up to his classmate.

Tenya was deeply shocked to discover he and his family were spies for All For One. He had a saddened look on his face while Yuga was interrogated for his betrayal. However, he declares that Yuga's actions are all in the past, and as his friend, he must reach his hand out to him if they are to stand as equals, showing that he doesn't hold any grudge towards Yuga.

All Might
There has not been much interaction between them but Yuga respects All Might for his heroism.

Yuga watched intently as his teacher participated in the Kamino Incident and was happy that he succeeded over All For One.

When his parents were discussing his status as the traitor, Yuga revealed his false hope to be free after seeing the former No. 1 hero defeat the villain.

After Izuku and Toru expose Yuga, All Might reflected on his Yuga's troubles and was sad that it led to this.

Shota Aizawa
While they do not have much interaction Shota cares for him as his homeroom teacher, just as he does with the rest of his students.

When Yuga's status as a traitor was revealed, Shota apologized to Nezu for not realizing the situation earlier. After seeing the other students continue to show Yuga acceptance, Shota told Yuga he would not expel him. This statement stunned Yuga with compassion from both his peers and teacher.

All For One
After being contacted by his parents, All For One was responsible for giving Yuga his Quirk. Despite Navel Laser being a poor fit for Yuga’s body, and thus being forced to rely on a support belt courtesy of his parents, he was happy with what he had received. However, All For One would return to collect on this debt and in turn, forced Yuga to become his mole within U.A. High School under the threat of death to him and his parents.

Yuga heavily resents All For One for exploiting him and his parents. He confided in his parents that he believed he was free upon witnessing All Might defeat him. However, these hopes were dashed after he broke out of Tartarus.