Kyoji Takajo is a young man from a well-established and noble family who chose to distance himself from his privileged background. He was previously employed part-time at a convenience store, having left his birthright behind to live independently and prove that he could succeed through his own efforts without relying on anyone else. This decision left him with a persistent sense of low self-esteem and underdeveloped social skills. He is a serious, stoic individual who works hard but often struggles with feelings of inadequacy, even after joining the idol agency 315 Production. His core motivation is to demonstrate his own strength and worth away from the shadow of his lineage, and he approaches his idol career with a quiet determination to overcome his insecurities.

In the anime The Idolm@ster SideM Wake Atte Mini!, Kyoji appears as a supporting character and a member of the idol unit Beit, alongside his partners Minori and Pierre. The series presents the daily lives of the agency's idols in a chibi-style, comedic format, so his role is primarily that of an ensemble player. He takes part in the unit's lighthearted activities, reacting to the chaotic and playful situations with his characteristic restraint and occasional bewilderment. Although the short episodes do not dive deeply into personal arcs, his presence highlights the contrast between his stiff, polite demeanor and the more exuberant personalities around him.

His most important relationships are with his fellow Beit members. Minori and Pierre serve as both teammates and a source of warmth, gently drawing him out and providing the supportive environment he needs to gradually open up. Within the broader 315 Production cast, his interactions are often brief but reveal a polite, diligent young man who is still learning how to connect with others. The key development for Kyoji lies in the slow building of confidence through his idol work and the friendships he forms, even if the short-form nature of the series leaves much of this growth implied by his backstory rather than explicitly shown on screen.

Notable abilities include his classification as an intelligent-type idol, suggesting a quick mind, problem-solving skills, and a talent for strategy or games. While his performance strengths are not heavily detailed, his earnestness and dedication shine through his efforts on stage. The contrast between his noble upbringing, his past as a convenience store clerk, and his current life as an idol shapes a character defined by quiet perseverance and a genuine desire to stand on his own.