Shadow Fish

Shadowfish are supernatural creatures from another dimension that King Andrias' ancestors presumably conquered, where they were brought to Amphibia with the Calamity Box and kept locked away inside the basement of Newtopia castle.

Biology
Shadowfish are vivd colored ghost-like entities which can phase through anything, they appear come in multiple shapes and sizes. So far, their exact aggressive levels and food source remain unclear. When exposed to mirrors, Shadowfish will instantly become physical.

Appearance

 * Amphibia:
 * s02e18, "The Sleepover to End All Sleepovers" (2020)
 * s02e25, "The First Temple" (2021)
 * s03e13, "Olivia and Yunan" (2021)