Juuza Mishima, the Young Company President, emerges as a significant antagonist within the *Nuku Nuku DASH!* narrative. He orchestrates a malignant corporate takeover of the Mishima Corporation, seeking to consolidate power by eliminating rivals and restructuring the organization. His methods include framing incidents as accidents to remove internal opposition, such as deliberately releasing a rogue robot to attack himself and Nuku Nuku while intending to blame higher-level executives.

A critical revelation identifies him as an advanced androbot, forged from the same technology as Nuku Nuku. This artificial nature grants him enhanced capabilities vital to his schemes. He possesses knowledge of Nuku Nuku's operational secrets, specifically that her tactical combat mode activates only when a human life requires protection.

His background is intrinsically linked to Nuku Nuku and her counterpart's creation. He reveals both androbots were developed using the biological template of a woman Professor Higuchi loved. While Nuku Nuku was designed as a protective failsafe, her unnamed twin was programmed with a mandate to destroy all life. The Young President engineers the activation of this destructive twin as part of his endgame, aiming to deploy it against Maneki City.

His confrontation culminates in a direct challenge to the corporation's leadership. He exposes the executive board members as clones of the company's founder before subduing them using his own androbot assistant. He subsequently takes Akiko Natsume hostage to leverage her connection to Nuku Nuku.