An Aquatic Digimon said to be able to cure all ailments and wounds. It has the ability to prophesize calamities or plagues that are to strike the Digital World, and has been sighted delivering warnings throughout various areas. Its body resembles that of a mermaid, but it can float and move on land as well. However, it gradually dries up if it stays away from a body of water.
Ariemon's hair-like body part is composed of seawater data which can be freely transformed for offensive or defensive purposes, as well as serve as a bed for young Digimon.
A benevolent soul, it shies away from causing unnecessary harm to its enemies, often content to capture and immobilize them. It also looks after young Aquatic Digimon—such as by conjuring large shells for them to take refuge in—and works to protect the ecosystem.
Ariemon's special moves are Entangling Algae, in which it extends the ribbon wrapped around its shell staff to immobilize enemies; Tidal Spear, which imbues its staff with seawater and transforms it into a spear to impale its foes; and Cleansing Waters, which summons invigorating seawater to cleanse any wounds or illnesses.