"I can't wait! I can't wait to see the look on your face as you die! I win! I'll send your head flying!" - Risotto Nero to the Boss (Rizotto Nēro, リゾット・ネエロ)
Metallica manifests itself inside Risotto's body as a swarm of small metallic beings with stitches across their individual bodies. Their mouths are shaped as though they are moaning or screaming. Its design is based on human cells, red blood cells, and the hattifatteners of the Moomins. Metallica is presented with a silvery color in the colored manga.
Although Metallica's movesets are unknown, according to the manga, Metallica's sessile nature prevents it from attacking on its own, however, the magnetic power it produces is highly lethal. Risotto is capable of using this ability to its fullest, particularly to stealth assassinate targets. Therefore, the game's movesets might surround the stand's abilities around this theme.
- Metallica's name is a reference to the American heavy metal band Metallica.
- Unlike many other stands, Metallica is one of the few stands that have several entities/manifests as a group stand, featuring several different creatures.