Bogosse Masqué, known as Sweet Mask, strategically maintains his position as the Hero Association's top A-Class hero, deliberately avoiding S-Class promotion to block heroes he considers unworthy. His public image merges idol, actor, model, and singer careers, using widespread popularity to project elegance and charm. He consistently displays a relaxed, stylish demeanor publicly, yet privately exhibits profound egocentrism and contempt for heroes he judges weak—especially S-Class figures like Atomic Samurai, Superalloy Blackluster, and Puri-Puri Prisoner. He reserves respect solely for King, valuing his perceived strength and courage, and asserts that he should lead S-Class missions, including the assault on the Monster Association headquarters. Ruthless and rigid in his justice, he executes defeated enemies without hesitation—surrendering aliens during the Alien Invasion, incapacitated monsters, and humans affiliated with "enemies of justice," as demonstrated when he nearly killed mind-controlled mercenaries and threatened Iaian’s group. Genos observes his obsessive, psychopathic disgust toward weakness and lower-class heroes. A critical vulnerability is his cacophobia (fear of ugliness), which paralyzes him against grotesque foes like Fuhrer Ugly, triggering severe nosebleeds and paranoia about his reputation. He harbors a secret: he is a monster disguised as human. Princess Super S uncovered this truth, leading him to kill her instantly to ensure silence. This monstrous identity drives actions like eliminating witnesses during the Monster Association raid. Despite this, he admires Blast—who once saved him—and recalling Blast’s intervention helps him restrain violent urges against allies. Key arcs highlight his moral ambiguity. He executed defenseless aliens during the Alien Invasion, ignored S-Class objections, and clashed with S-Class heroes over leadership in the Monster Association raid, insulting Zombieman’s appearance. Leading the surface team, he faltered against Fuhrer Ugly due to his phobia. His backstory confirms he held A-Class rank #1 for three months before the Deep Sea King arc, retaining it via popularity and combat skill. He defies non-combat orders, executing the monster Homo Apwalus despite capture directives. Internal conflict emerges when his celebrity status clashes with monstrous instincts. Though image-focused, his admiration for Blast occasionally tempers dark impulses, revealing a tension between his hidden nature and heroic facade.