Masuo Ikari, surnamed 井狩益男, leads the declining Party of Rage, tasked with reversing its waning influence by recruiting Retsuko as a candidate for the National Diet. His efforts focus on reinvigorating the party’s public standing through strategic alliances.

Modeled after a Lesser Bushbaby (Galago), he sports brown fur, a white muzzle, pink-tinted inner ears, and a black tail. Notable features include vivid red eyes, a prominent overbite, and a faint blue hue encircling his upper lips. His attire remains consistent: a light brown business suit with a white collar, red tie, black undershirt, dress pants, and black-framed glasses.

Temperamental and shrewd, Masuo employs calculated persistence to manipulate others, channeling their discontent to further his political objectives. His interactions reveal a tactical approach to persuasion, often exploiting frustration as a tool for recruitment. The surname "Ikari" phonetically echoes the Japanese term for "rage" (怒り), aligning with his party’s combative identity.

His documented involvement centers on orchestrating Retsuko’s campaign, with prior history, personal motivations, and extended relationships undefined in available narratives.