Nicolai Asakura possesses a multicultural heritage: a father of Russian descent with family roots in Denmark and a Korean mother from Australia. His family moved to Japan during his childhood because of his parents' work, resulting in frequent moves across different Japanese regions. These constant relocations resulted in mixed speech patterns, blending multiple Japanese dialects with English and Korean.

He struggles with social communication, often causing others to misinterpret his demeanor as anger or unfriendliness. This difficulty historically prevented stable group affiliations. Before joining the Eternal Boys, he worked as a driver for Manpuku Talent Productions and held a position at the tavern Shoppe. His central motivation is a longstanding search for belonging, particularly as a middle-aged individual seeking purpose and community.

He joined the Eternal Boys idol group following former member Makoto Kakizaki's departure. This integration marks a pivotal step in his journey toward finding connection. In subsequent events, he participates in group activities with the Eternal Boys, including securing minor acting roles in a television production, engaging in a sports festival, and performing new musical material in elaborate stage costumes. These experiences further his ongoing process of building camaraderie and establishing his place within the group.