Sour Face

Sour Face (ニガムシ, Nigamushi) is a martial artist and user of the Sour Face Style Martial Arts.

Appearance
Sour Face is a rather large muscular man, but his most noticeable feature is his taut face, strained to the point where it appears that he has been eating foods that were too sour, and a cleft chin.

Personality
Sour Face enjoys denigrating Charanko for his lack of etiquette in practicing martial arts, from slacking off during training to entering the Super Fight tournament behind Bang's back, although in the latter case he was unaware that Saitama had entered under the then-injured Charanko's name. As one of Bang's former disciples, Sour Face holds his former master in high esteem. He also nurses a grudge against Garou, who had rampaged across the dojo and severely injured him, forcing him to quit. However, he still fears Garou: Saitama emphasizes that Sour Face had left Bang's dojo after the incident and entered the Super Fight to "pretend to fight" Garou, whereas Charanko had challenged Garou alone and head on, albeit foolishly.

He seems to be very nervous in front of crowds.

While he did leave Bang, he still seems to heavily respect him, help fix Saitamas belt, and also praises him for insulting Zakos after Zakos insulted both him and Bang, showing he has a kinder side to him.

History
Sour Face was once a disciple of Bang, but left after Garou rampaged through the dojo. Sometime afterwards, he created the Sour Face Style Martial Arts and started his own dojo.

Monster Raid Arc
Sour Face is participating in the Martial Arts Tournament. He has a short discussion with Saitama about an incident that happened at the martial arts tournament in the past, when Garou decided to enter the tournament disguised as Wolfman, indirectly causing Saitama to become nervous by noting that the police will be called in if disguises are used during the tournament. He also states that he wishes to win the tournament so that he will never be intimidated if he ever faces Bang or Garou in the future and reminisces Garou's rampage through the dojo. Saitama outright states that what Sour Face is doing is pitiful, as he is simply using the tournament to pretend to fight Garou while Charanko had fought Garou head on and by himself. Sour Face leaves the waiting room aggravated, directing a challenge at Saitama so that they might both fight in the ring for real.

After the tournament introductions, Saitama converses with Sour Face when Zakos appears and starts questioning Saitama. Sour Face ends up answering some of Zakos questions. Zakos then reveals that Bang was supposed to be one of the judges, much to Sour Face's surprise, and starts mocking the martial arts master. Sour Face starts to feel very insulted, but felt even angrier when "Charanko" did not seem angry at Zakos's comments. Saitama replies that he was not invested in the conversation and is only looking forward to fighting Zakos, but notes that Zakos doesn't seem strong. Sour Face compliments Saitama's remarks.

Abilities & Powers
Sour Face cites himself as the second most powerful disciple after Garou, who implicitly confirmed his skill by approaching him to voice his intent to rampage in the dojo. Furthermore, although Bang had claimed that all his best disciples beaten by Garou were crippled for life, Sour Face, who was among those disciples who suffered injury at Garou's hands, does not seem to be debilitated by his past injuries.

As he had used Charanko as a training dummy for his strangulation moves in the past, Sour Face is likely capable of executing them as well.

Fighting Styles
Sour Face Style Martial Arts (ニガムシ流拳法, Nigamushi-ryū kenpō): Has not been shown yet.

Water Stream Rock Smashing Fist (流水岩砕拳, Ryūsui Gansai-ken): He presumably knows this style to a notable degree judging from his apparent expertise under Bang's tutelage.