- "My shoulders bear the weight of all that Meca One has done. All that I can do now is try to prevent him from achieving his dark goals."
- ―Sensei Keiken
Sensei Keiken is the leader of the Exo-Force team. He is often disobeyed by the five Exo-Force pilots. Keiken is also the grandfather of team member Hitomi, and the creator Meca One.
Keiken has long grey hair and wears a predominantly white uniform. He has a gray belt on his torso and a double-sided head, one side of which bears a stoic expression, and the other an angry one.
Before the first rebellion, he was one of the lead designers of the mining robots that later malfunctioned, becoming the Devastators.
- He uses the same hairpiece as Professor Dumbledore and a variation of Gandalf.
- He is the second rarest figure in the Exo-Force theme, appearing in only 2 sets (Hitomi appearing only in one set).
- He is the only human Exo-Force minifigure that appeared in different years but never changed its outfit.
A manga representation of Keiken, alongside his minifigure version
Keiken's two different expressions, one on each side of his head