Yuu Nikaidou

He's actually an Easter member. To find the Embrio, he became a teacher, disguised himself with a clumsy, yet kind-hearted teacher. It's revealed that he's actually hates kid. When he fought Amu, Suu repaired Nikaido's former Shugo Chara, that broke even before it was hatched. Nikaido happy that he finally can meet his Shugo Chara, and his happiness make him go back to his old dream, to become a robot engineer, and quit Easter.

Before the series begin, Nikaido dated Yukari Sanjo, but they're finished over. He then fix his relationship with Yukari, and at the end they're married. He's voiced by Junji Majima.