Yasuhiro Muto/Relationships

Haruchiyo Sanzu
Mucho had a strong bond with Sanzu for he was his Fifth Division Vice Captain during his time in the Tokyo Manji Gang. They first met when Manjiro Sano instructed him to take Sanzu under his division due to the other leaders' ineptitude to discipline him, and Mucho accepted the offer without much care. After some time, he deduced that Sanzu was immensely tough to control, even went as far as to call him a "brat who cannot keep himself out of trouble," but eventually surmised that they mutually understood the feeling of desolation and not belonging anywhere. According to Mucho himself, Sanzu followed him around blindly and was unexpectedly more devoted to him than he thought he would be. It is possible that his loyalty stemmed from Mucho's generosity to gift him a mask to cover his facial scars and advice him to keep an eye out for himself other than the well-being of the "King'" (Mikey) one day while playing a game of Shogi. They embarked on missions together as part of their division's special duty, and after six months of remaining under the Fifth Division, he recognized Sanzu's abnormal strength and bravery and promoted him as his right-hand man. Their time together led Mucho to perceive him as a sibling, and for Sanzu to do the same. When Mucho revealed himself to be a traitor to Toman and a loyalist to Tenjiku as a member of the S62 Generation, he gave Sanzu a choice to either remain under Toman's administration or to follow him into Tenjiku's ranks. Sanzu claimed that he had found his place under Mucho's care and belonged beside him, and eagerly declared his allegiance to him without hesitation. However, his true intentions were divulged after he picked Mucho up from a penitentiary six months after the fight against Tenjiku and took him to Yokohama Bay where he slayed him with a katana, claiming that he was a traitor to Mikey and Toman as a whole. Mucho accepted the price of his betrayal and died with the tragic realization that Sanzu had not always been on his side all along.

Manjiro Sano
After the disbandment of the S62 Generation, Mikey recruited Mucho into Toman where he immediately swore allegiance to him. As a result of his loyalty and exceptional strength among the members, Mikey granted him the role as the Fifth Division Captain alongside the special power to instigate infighting as a way to snuff out traitors when necessary. It was evident that he had strong faith and trust in him, and saw him as a capable member of the gang that would lead his division to success despite the fact that Mucho was ironically a traitor himself. Later on, it was revealed that Mikey knew about Mucho's commitment to another "king" all along, but claimed that he cared about his allegiance to him more than his devotion to another gang.

Izana Kurokawa
At a juvenile detention center when he was thirteen years old, Mucho met Izana and formed an alliance with him under the banner of the S62 Generation. This alliance led him to put a massive amount of trust on Izana for they committed crimes and formed gangs together to yield even greater amounts of money alongside the four other members of S62. He was more loyal to Izana than Mikey, as proven by his betrayal to Toman once Izana jumped back into action after mysteriously dissolving S62 years prior and his willingness to kill Takemichi Hanagaki as mandated by Izana during the fight at Yokohama Bay, the result of his refusal to lose against Toman in a one-on-one fight.