Yamato Nikaidou is a member of the idol group IDOLiSH7 in the anime series Idolish7. He is known for his mature and reliable personality, often acting as a big brother figure to the other group members. Despite his calm exterior, Yamato has a mysterious side and keeps his past hidden from others. As the oldest member, he helps mediate conflicts within the group and supports his teammates through challenges, playing a crucial role in their growth and unity as an idol group.