Saitama/Relationships

At the start of the series, Saitama spent most of his time being a hero alone, but after meeting Genos and joining the Hero Association, he gradually gained numerous acquaintances and rivals.

Genos
Saitama met Genos after the latter was defeated by a monster and tried to self-destruct, but was instead saved by Saitama. After being saved, Genos asked Saitama to take him on as a disciple, to which Saitama nonchalantly accepts, thinking that Genos was not being serious. Though Saitama was initially annoyed by the thought of having an apprentice, he gradually warmed up to Genos, even becoming slightly worried and concerned when he saw Genos' limp body after he was defeated by the Sea King. Saitama holds some respect for Genos since he became an S-Class Hero right off the bat, and desires to move up the ranks due to his S-Class status. Genos has become Saitama's companion and friend (or at least close to it). He is also the person who he spends most of his time with, since Genos moved into Saitama's apartment to live with him. Although Saitama has yet to officially call him his disciple (as Genos is always the one identifying himself as his disciple), Saitama actually trys to train him, but since Saitama only knows strength training (which wouldn't help by Genos, due to him being a cyborg), most of Saitama's advices/lessons are made up and only an excuse to keep the cyborg occupied. Despite this however, Saitama does manage to give Genos some relatively good advice from time to time. Saitama also shows some concern whenever he sees Genos in a rough state, asking him if he was still alive after seeing him defeated by the Deep Sea King and even got shocked when he was smashed into a rock by Tatsumaki. Saitama also seems to have enough confidence in Genos to handle certain threats alone, as seen when he accepted Genos' request to fight G4 alone without any pressure (although he asked him if he needs help) and would only help/save Genos, when he sees him in need.

Bang
Saitama met Bang when the giant meteor was falling towards Z-City. Bang was amazed by Saitama's strength, and had tried numerous times to recruit him into his dojo, albeit unsuccessfully. Bang will occasionally invite him to cookouts and vice versa.

King
King (unintentionally) took credit for killing five mysterious beings that were actually killed by Saitama. This caused King to gain the fame and 'fortune' as an S-Class Hero. Saitama eventually discovered King's true personality and the secret to his success. Saitama was not upset or angry at King's secret, and the two would go on to become friends. Saitama would go to King's house to play video games, and regularly gets frustrated at losing to King. King is probably one of the few people whom Saitama considers a genuine friend.

'The following section contains Webcomic spoilers. You have been warned manga-only readers.'

Flashy Flash
Flash and Saitama had a brief scuffle after Flash mistook him for a monster. After clearing the misunderstanding, the two became acquaintanted with one another, with Flash acknowledging Saitama's superior abilities.

After being defeated by Garou, Flash was one of the few who regained consciousness and was able to witness Saitama defeating Garou. In addition to acknowledging Saitama's strength, Flash has decided that he wants to teach Saitama some proper fighting techniques.

Fubuki
Fubuki, after her first encounter with Saitama, was sometimes seen along with King and Genos hanging out in Saitama’s abode. She is apparently obsessed with making Saitama join the Blizzard Group after witnessing how powerful he was when she fought him in his apartment and how he fended off Sonic. Her latest attempt was to beat Saitama in a video game competition, which failed due to King’s assistance.

'The following section contains Webcomic spoilers. You have been warned manga-only readers.'

Saitama himself declared that he does not view Fubuki as a friend, but as an "acquaintance", showing that their relationship has not really progressed at all. After witnessing Saitama go toe-to-toe with Tatsumaki, her obsession with him only grows stronger, as she vows to make him join her group at any cost. She also decides to join A-Class after the battle.

Zombieman
'The following section contains Webcomic spoilers. You have been warned manga-only readers.'

While the two have had little interaction, Zombieman is one of the only people who is aware of Saitama's true strength after witnessing his fight against Garou, which is related to a warning that Genus gave to Zombieman behind the House of Evolution's reformed life. He asks Genus to remove his limiter as well and make him equal to Saitama, as he feels inferior to the B-Class Hero.

Tatsumaki
In their first encounter, Tatsumaki didn't think much of Saitama due to his ranking, and would regularly insult him. She feels insulted whenever Saitama ignores her. Saitama once mistook Tatsumaki for a little girl due to her small stature, and found her to be annoying.

'The following section contains Webcomic spoilers. You have been warned manga-only readers.'

Their next encounter would be when they 'fought' in the Psychic Sisters Arc, which is when Tatsumaki discovers Saitama's true power. Saitama displayed concern and interest toward Tatsumaki, as he ran after her to see if she would be alright flying home with her injuries, and was interested in why Tatsumaki pushes everyone away. However, Tatsumaki simply yelled at him, causing him to be even more irritated at her behavior. Tatsumaki came close to revealing her past with Blast to Saitama before deciding not to.

In an audiobook, it is revealed that the two actually met in a haunted house at a festival Saitama worked at. Saitama thought Tatsumaki was a lost child, and Tatsumaki called him a balding samurai and thought he was a ghost when her powers didn't work on him.

Mumen Rider
Saitama and Mumen Rider share a mutual respect for one another, and a possible friendship.

Saitama respects and acknowledges Mumen Rider's ability to continuously meet the weekly quotas of the C-Class heroes, something Saitama found to be a difficult job. He also compliments Mumen Rider for putting up a nice fight against the Sea King. Mumen Rider is one of the few who knows of Saitama's true strength, and treats him respectfully as a fellow hero. He sent Saitama a thank-you letter for defeating the Sea King and offered to treat him to dinner, where he personally thanked Saitama, further showing Mumen Rider's humble and respectful nature.

In an extra chapter, it is revealed that he and Saitama were once schoolmates, but neither are aware of this fact.

'The following section contains Webcomic spoilers. You have been warned manga-only readers.'

Forte
One of Saitama's new neighbors after he moved to A-City. Originally Forte thought little of Saitama, seeking to abuse his upper rank status to pressure him. After witnessing a seismic event caused by his fighting (unknown to him Saitama was going go toe-to-toe against Tatsumaki at the time) he realizes neither he, nor his accomplices, could hold a candle to Saitama.

Sneck
Originally Sneck thought little of Saitama due to his rank, as well as the fact that Saitama almost flunked the hero exam. But after he heard about Saitama breaking the exam's physical records and being swiftly defeated by the rookie, Sneck began to recognize Saitama's abilities. Saitama once unknowingly avenged Sneck when he killed the Sea King, and defended his honor when he and the other heroes who were defeated by Sea King were being insulted. Sneck was the only person in the Super Fight tournament who was able to figure out he was not Charanko (but it did take him a while).

He saved Sneck from being crushed by Bakuzan.

Sweet Mask
At first, Sweet Mask looks upon Saitama with his typical disinterest in the lower class heroes. When first hearing mention of him after Saitama killed the Sea King, Mr. Mask opinion relegates the newbie as having the aura of a B-Class hero, based on appearances via the video feed alone.

'The following section contains Webcomic spoilers. You have been warned manga-only readers.'

After witnessing Saitama defeat Garou however, not only does Sweet Mask fully acknowledge Saitama's tremendous strength, but becomes somewhat obsessed with him, considering him to possess the true beauty of overwhelming power.

Suiryu
Suiryu holds great respect for Saitama not only because of his strength and humble personality, but also for the fact that they share the same dilemma in finding worthy opponents to fight. Suiryu also admits that Saitama is the only person worthy enough for him to share his disdain for the hero lifestyle, in which he keeps hidden in his sub-consciousness.

After being defeated by Saitama from a hip strike, he begins to fear Saitama, not wanting to bump into him again in the future.

After witnessing Saitama defeat both Bakuzan and Gouketsu with little effort, Suiryu not only acknowledges Saitama's god-like power, but also becomes very grateful to Saitama for saving his life and goes as far as to asking to become Saitama's apprentice (like Genos), only for him to decline. Furthermore, after witnessing Saitama's heroic deeds, he now aspires to become a hero.

Speed-o'-Sound Sonic
Speed-o'-Sound Sonic views Saitama as his eternal rival and vows to defeat him. Saitama views their one-sided rivalry relationship in a nonchalant manner. He does not mind Sonic's persistence and their continuous 'battles', even going so far as to encourage Sonic to do his best. However, he does grow irritated if Sonic starts to bother him during important activities, or causes havoc around others.

According to Genos, Sonic is one of the few people who recognizes Saitama's true strength. This recognition is what caused Sonic to stop working and continue training in order to surpass Saitama. This recognition and dedication, as well as declaring Saitama a rival and admitting defeat at his hands, indicates (in his own way) a form of respect that Sonic has for Saitama.

Dr. Genus
After witnessing the destruction of several of his creations, Genus began to study Saitama. He theorized that at some point during his training, Saitama broke through a natural limiter that humans have, but having paid the price with his hair and his emotions.

It is also shown that Genus holds a great deal of respect for Saitama due to his efforts to successfully remove his limiter to attain godly power, defining all of Genus' ideology about artificial evolution to create better and stronger beings, as well as his desire for eternal life. Furthermore, he respectfully appreciates the fact that Saitama shows him that human willpower alone is able to lift one to incredible heights.

Boros
Saitama sympathizes with Boros for not being able to find a worthy enough opponent that could give him a stimulating fight. While Boros admits that Saitama is far stronger, Saitama has respect for Boros and deems him the strongest opponent he has ever faced.

Choze
Choze formed a grudge against Saitama after the latter defeated him in a match while yawning. In his monster form, Choze believed that he could defeat Saitama. Ultimately, Choze would never get his chance for revenge, as he was defeated by Suiryu soon afterwards.

Garou
Saitama first encountered Garou while shopping for a wig, and easily defeats him. He then defeats Garou again with a single kick. He defeated Garou a third time after he dined-and-dashed.

'The following section contains Webcomic spoilers. You have been warned manga-only readers.' Garou displayed hatred toward Saitama during their fight, viewing Saitama as the personification of the collective unfairness of the world. Adding to that, Saitama is a hero, and represented everything that Garou hated and was fighting against. Saitama is responsible for defeating Garou both physically and mentally, realizing that Garou wanted to be a hero instead of a villain.

Saitama showed mercy towards Garou, refusing to kill him and acknowledging his flaws.