Gakusha is an intellectually gifted mouse characterized by prominent glasses and a notably short tail. His name translates directly to "scholar," reflecting his primary role as the group's strategist and problem-solver. He shares a long-standing childhood friendship with Yoisho, forming a foundation of trust within their dynamic.

As the tactical mind behind the group's endeavors, Gakusha applies extensive knowledge to overcome obstacles. Facing starvation and transportation issues after a shipwreck, he designs and constructs a functional boat using salvaged scrap metal from a derelict battleship, ensuring their voyage continues and demonstrating resourceful intelligence in crisis.

His analytical nature serves as a voice of reason, providing critical insights during planning or confrontations. Though not primarily a combatant, his contributions through planning, logistics, and technical solutions prove vital to the group's cohesion and survival during their mission against Noroi.

In the 2015 CG film *Gamba: Gamba to Nakama-tachi*, his core attributes—intelligence, glasses, short tail, and steadfast loyalty to Yoisho and the team—remain consistent with prior portrayals. No confirmed appearances, including the 1991 film *The Adventure of Gamba and Otters* or other spin-offs, explore his origins, further personal history, or substantive evolution beyond his established role as scholar and tactician. His portrayal consistently focuses on intellectual support and camaraderie.