Kawaguchi Yoohei (Japanese: 川口洋平), born 1974, is a freelance digital illustrator who has provided artwork for the Pokémon series. He began work with the Pokémon Trading Card Game, illustrating the Walrein, Hippopotas, and Nidorino included in the Rising Rivals expansion. He is often credited by his nickname "kawayoo" (川洋) in his work.
Youhei's style is very distinctive, brought about from his creative approach and dedication to each one of his illustrations. He creates subjects from scratch by using a graphic tablet in image editing software and applying hundreds of strokes to define base shapes, outlines, backgrounds and final details. These result in often surreal, heavy, multi-layered images reminiscent of oil paintings. His images often focus on muscle tone, expression or contrast and have themes influenced by cyberpunk or anime. The Pokémon he has portrayed are often very detailed, vibrant and in dynamic positions, among which include the Pokémon cards, which he provided all the artwork for (with the exception of LV.X variants).
Youhei drew the promotional artwork, which includes booster pack art and theme deck art, for every expansion in the HeartGold & SoulSilver series. Outside the TCG, he illustrated maps and other promotional artwork for Pokémon Omega Ruby and Alpha Sapphire and every Generation VII core series game.
Thus far, kawayoo has illustrated 195 cards for the TCG. For a list of cards he has illustrated, go here.
Typhlosion for HeartGold & SoulSilver
Feraligatr for HeartGold & SoulSilver
Ho-Oh for HeartGold & SoulSilver
Lugia for HeartGold & SoulSilver
Entei for Unleashed
Rayquaza for Undaunted
Alola for Ultra Sun and Ultra Moon