Tenzan is a mech-styled golem originally created by the legendary inventor Prospero Flanca. It now serves Prospero's granddaughter, Nanoca Flanka. Despite its relative age, Tenzan remains technologically superior to most other golems, a testament to both Prospero's original design and Nanoca's subsequent enhancements. These modifications grant it additional features activated as needed for diverse situations.

While operating under Nanoca's direct orders, Tenzan frequently acts autonomously without requiring her active steering or continuous control. Its communication is limited to the single phrase, "Yes Sir," belying the scope of its independent function. Nanoca considers Tenzan more than a mere machine or possession, treating it as a trusted companion and friend.

Within Tristia's city revitalization project, Tenzan provides steadfast support to Nanoca. Its capabilities shine during competitive events like golem battles, where it actively participates as a combatant alongside Nanoca in mechanical confrontations.