Vaporeon shares physical traits with aquatic animals, such as seals, fish and land creatures in appearance. Vaporeon's body is light-blue with a white ruff around its neck. Vaporeon has cream-yellowish ears-like fins made of webbing on both sides of its head along with a third on the top. Vaporeon has blue ridges that run down the length of its spine and on to its tail-fin. The tail resembles that of a mermaid's.
Vaporeon's molecular structure is close to water, and its body glitters when sunlight hits at certain angles because of it. It has a graceful, slender body shape, further adapting it to aquatic regions so it could swim faster. Its face is feline in structure, with a short muzzle and a small, triangular nose. Vaporeon is the result of an Eevee's exposure to the radiation of a Water Stone.
Vaporeon have the ability Water Absorb. This allows Vaporeon to absorb any Water-type moves and heal themselves. Vaporeon are highly adapted to aquatic life. Unlike its pre-evolution, it has the ability to breathe underwater. Vaporeon has the power to melt into water and disappear, and are shown to be able to manipulate water molecules. In "Black and White", Vaporeon will have the Hydration ability if they're caught in the Dream World.
Vaporeon is one of the eight Pokémon that evolved from Eevee. It Evolves from Eevee by use of the Water Stone.
Vaporeon is the only Eeveelution that doesn't have three syllables in its name (Excluding its pre-evolution, Eevee). Instead, Vaporeon has four.
Like all Eeveelutions, Vaporeon has primarily mammalian features mixed with traits of many aquatic creatures such as tropical fish and seals. As it has been referred to as a mermaid, it is possible that Vaporeon is also based on the Merlion, a mythological creature with the head of a lion and the body of a fish.
It is possible that Vaporeon may also be a visual pun on the catfish.
Vaporeon's name comes from the words vapor and eon. Also, its Japanese name, Shawaazu, is a pun on 'showers' as in the rain, like Jolteon and Flareon.