Niko

Ishikawa Naritoshi (石川成敏) or Niko (ニコ) is a member of the Litchi Hikari Club. He is highly respectful of the club leader, Zera, and is willing to do anything for him.

He is appointed number one (Eins) by Zera.

Personality
Niko first started off as a depressed and sulky person and then grew into someone shy and happy after he became friends with Tamiya. He started smiling more after the boy told him numerous times to and seemed genuinely happy to be friends with him.

Their friendship and Niko's happiness all came to an end after Zera joined the Club and declared himself as the Emperor. Niko started taking his position as number one very serious, going as far as ruining his friendships and giving up his right eye for Litchi.

His loyalty is very strong, especially for Zera.

It also seems like he has a major problem with money in his life (as seen in him stealing everyone's lunch money in class and working summer jobs to earn a living).