Simipour is a blue monkey-like Pokémon that shares its design theme with Simisage and Simisear. Its "hair" is blue and resembles dreadlocks. Its appearance is similar to a female mermaid. Its appearance does not change if it is male.
Simipour is probably named after the words "Simian" which means monkey and "Pour", which is indicative of its status as a Water-type Pokémon.