Hikoma Kusakabe (日下部 彦馬 Kusakabe Hikoma), affectionately known as "Jii" (ジイ "Jii" translated as "old man" or "samurai"), is the Shinkenger's mentor and ally, he trained Takeru and is like a father figure to him. Takeru wants Jii to go to the doctor, which he refuses and ends up at the Hikari Studio, where Mr. Hikari helps him. He hides from his ilk when they enter but then reveals to Tsukasa that he is worried if they will ever come back after a battle.