Tasuke Tokugawa, a scion of the Tokugawa family with generations of technical service, serves aboard the spaceship Yamato as an engineering specialist. In the original continuity, he is the second son of the late Chief Engineer Hikozaemon Tokugawa, training to inherit his father’s role. Following Hikozaemon’s death, Tasuke assists Sho Yamazaki in the engine room before rising to Chief Engineer in later missions, including commanding the engineering team during events like *Resurrection*.

Reboot continuity repositions Tasuke as Hikozaemon’s grandson, continuing the family’s engineering tradition. Introduced through early video communications alongside his younger sister, Aiko, he operates under Yamazaki’s supervision while preparing to lead the engineering division upon Hikozaemon’s eventual retirement or passing.

Consistently portrayed across adaptations, Tasuke prioritizes the Yamato’s functionality, evolving from diligent technician to seasoned leader. His arc underscores inherited duty, mentorship under seasoned colleagues, and the quiet resolve to uphold his family’s legacy through technical excellence and incremental responsibility.