Dewott is a bipedal, otter-like Pokémon that is primarily light blue. It has small black ears, a pointed crest at the back of its head, a red nose, and long white whiskers forming tilted V-shapes. Two pointed teeth are visible in the upper jaw when its mouth is open. Its forelimbs have three fingers on each black paw. Its feet and flat tail are black. Around its waist is a large, dark blue, fringed arrangement of fur, with two scalchops on the thighs.
Dewott's scalchops are detachable, and Dewott trains to use several techniques with them. As a result of training, Dewott can pull an incredible double-scalchop technique. This technique can defeat even those who master the art of swordsmanship. When exposed to the harsh environment of Hisui, Dewott gains an additional Dark-type when it evolves into Hisuian Samurott.
Dewott may be a combination of dew, water, and otter. It may also involve duel or dual (referring to the two scalchops it fights with), or duo (Italian for two, referring to its place in its evolutionary line). Notably, Helen DeWitt is the name of the author of The Last Samurai.
Futachimaru may be a combination of 二つ futatsu (two), 太刀 tachi (long sword), and 丸 maru (round; common suffix in male Japanese names).