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Yamato Nikaido comes across as very lazy and easy-going, but he is very passionate about what he does and cares a lot about the other members of IDOLiSH7. He took up the position of “Leader” only because he was the oldest in the group, he actually considered pulling himself out of the audition for IDOLiSH7.

Yamato has held a very deep dislike towards the entertainment world in general before joining the agency, and it's implied that he was connected to it himself at some point in the past.

In regard to how Yamato was scouted, Yamato had already gotten an offer from an acquaintance who was quite persistent, but then Otoharu Takanashi appeared and under the guise of the person’s backer, convinced Yamato to join Takanashi Production instead. Yamato describes it as a scenario where he refers to himself as the girlfriend, and the wing-man (Otoharu) ends up stealing the girlfriend instead of supporting the guy.