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. 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) 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 S-62 Generation, he gave Sanzu a choice to either remain under Toman or to follow him into Tenjiku. 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.