Kai Hirose (広瀬 海, Hirose Kai?)
Voiced by Takehito Koyasu
The speed warrior. Kai is head of the student council and practitioner of Kendo. He is almost always seen carrying a Shinai, which he uses to enforce the rules at school. He also tries to remind the team of their job and that it's not only fun and games, but does not always succeed since his strict, no-nonsense personality tends to rub them the wrong way.
|Try Dagwon||Kai = Turbo Kai|
|Yūgō Gattai||Turbo Kai + Turbo Liner = DagTurbo|
|Jūren Gattai (重連合体?, Coupling Combine)||DagTurbo + DagArmor + DagWing = Liner Dagwon|
|Chō Jūren Gattai (超重連合体?, Super Coupling Combine)||DagTurbo + DagArmor + DagWing + DagDrill = Super Liner Dagwon|