Simipour is a simian Pokémon that is primarily blue. Its ears are broad with light blue insides, and it has oval eyes and a small black nose. There are several tufts of fur on its head, which resemble dreadlocks. These tufts can store water, which it collects with its tail. Simipour has a white marking around its neck that resembles a ruff; and a cream-colored face, hands, arms, legs, and feet. Its hands have five fingers, and its feet have three toes. Its tail is tipped with a blue plume, resembling a spout of water. This tail can shoot water at such high pressure that it can destroy a concrete wall. Simipour prefers to live near clean water.
Simipour's official game artwork previously showed its entire tail to be completely blue instead of tan with a blue tip.
Simipour and its pre-evolution are the only non-starter Pokémon to have Torrent as a legally obtainable Ability, in this case, as a Hidden Ability.
Simipour is based on a monkey and a fountain; because of this, it may have been inspired by the water dwelling monkey-like creature ahuizotl, or may be a visual pun on Sea-Monkeys. The ability to store water in its hair may also reference the Kappa, a Japanese reptilian yōkai that stores water on a dish of sorts on its head. Its chest fur resembles that of a volcano and may have possibly been based on geysers, subaqueous volcanoes, cryovolcanoes, or the Guatemalan Volcán de Agua. Its chest fur may otherwise possibly represent the froth of a gushing waterfall, with its blue locks symbolizing the waterfall.
It, along with its two contemporaries, seem to be inspired by the three wise monkeys motif; with its eyes closed, Simipour represents "see no evil".