Metal Uupa is a small metallic toy-like mascot character associated with Steins;Gate, appearing as a variant of the Upa collectible. It is not a major narrative character, but it is memorable as a recurring reference item tied to the series’ otaku culture and science-fiction atmosphere. In the story, Upa-themed items often serve as lighthearted visual details and collectibles, and Metal Uupa stands out as one of the recognizable versions that fans associate with the series’ quirky, playful side.