The World King/Rival Group

Rival Group in The World King consists of Okumi (the leader), Eyeshroom, and Lei Sun. Okumi debuted in Saving Cosmo, while Eyeshroom and Lei Sun debuted in both Battlegrounders and The Last Foreigner.

Okumi=
 * Full Name: Okumi
 * Age: 17 (in robot years)
 * Nationality: Japan
 * Birthplace: Tokyo
 * Favorite Food: N/A

An advanced robot from Tokyo and Robo's rival. He joined the tournament by forming the Rival Group with Lei Sun and Eyeshroom not only to defeat his rival, but to win the prize too. Nobody realized that he is actually a double agent working for Francis D. Casio to kidnapp them if they won.


 * -|Lei Sun=
 * Full Name: Lei Sun
 * Age: 23
 * Nationality: South Korea
 * Birthplace: Seoul
 * Favorite Food: Tteok

A highly trained Taekwondo expert from his master, Kim Lo Chou, he is invited to join The World King Tournament, to which accepted it just to show off his skills. All his moves' names are in Korean.


 * -|Eyeshroom=
 * Full Name: Eyeshroom
 * Age: 22
 * Nationality: Malaysia
 * Birthplace: George Town
 * Favorite Food: Spores

Born from a town of mushroom people, he is a high class psychic user who doesn't even use his hands, just his mind to move objects. He is invited to join the Rival group as he is Natsume's bitter rival when he visited Japan due to an accident.