Names：

KO-1

（Koichi Nanase）
Status： Member of Build Divers
Tags： PlayerMaleSpiritGunpla Battle Nexus OnlineBuild Divers
Control： Galbaldy Rebake
Brothers： Nami
Superior & Subordinate： Riku
World： the World of Plastic Model Simulation
Works： Gundam Build Divers
LeveL： A

Though he was once an excellent Gunpla builder good enough to appear in the World Tournament, a certain incident led to his retirement from Gunpla Battle. Four years ago, the members of his team decided to quit, after the scene shifted from GPD to GBN. The efforts of Riku and his friends touch Koichi's heart, and he decided to make his comeback as a member of their force.

Before Koichi retired from competition, it was said that he could have been number one in the world.

Koichi is the older brother of Nanami.

Though he was once an excellent Gunpla builder good enough to appear in the World Tournament, a certain incident led to his retirement from Gunpla Battle. Four years ago, the members of his team decided to quit, after the scene shifted from GPD to GBN. The efforts of Riku and his friends touch Koichi's heart, and he decided to make his comeback as a member of their force.

Before Koichi retired from competition, it was said that he could have been number one in the world.

Koichi is the older brother of Nanami.