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Nyorozo is a blue, bipedal Pokémon with a spherical body. It has bulbous eyes that protrude from the top of its head. A black and white swirl covers its belly, which is actually its organs showing through its thin skin. It appears to have white gloves on its hands and rounded, digit-less feet. When out of water, it sweats to keep its skin moist and healthy. This keeps it covered in an oily fluid that allows it to slip away from enemies. All of its skin feels this way except where its swirl is, which is instead very smooth. The swirl on its belly undulates slowly and staring at it induces drowsiness.

Even though Nyorozo is capable of moving on land, it prefers to stay in freshwater ponds and lakes where it has fewer natural enemies. It feeds on both bug and fish Pokémon. While it will leave the water to capture bug Pokémon, it will return and consume them underwater in safety. Its swirl is used to make children fall asleep. Nyorozo's sweat is filled with slimy mucus. When captured by an enemy, its either slithers to escape or use its swirl to put the enemy to sleep.