Zin serves in the unit Mechanica Metallica with a relaxed demeanor, often overlooking minor details. When excitement strikes, he experiences dromomania—an intense urge to wander. His aspiration to open a restaurant is impeded by a faulty tasting sensor, rendering his visually and aromatically appealing dishes unpalatable. He joined Mechanica Metallica after an invitation from Silve, who encountered him during travels. Zin participates in Babel to secure funding for his culinary venture.

Equipped with an enhanced smelling sensor, he compensates for his taste impairment by brewing consistently enjoyable tea. His introductory voice line identifies him as ZN-1001HM (where "ZN" corresponds to Zinc on the periodic table). He expresses a desire to fuse singing, dancing, and cooking to spread joy and invites others to sample his creations.