Plusle is a cream-colored bipedal Pokémon with red markings. It has a dot-like nose and a cream-colored plus sign in the middle of its circular red cheeks. It has long, flat ears that are mostly red. Its limbs are stubby and digitless, and it has red front paws. Its short tail is tipped with a red plus sign.

Plusle can create sparkly pom-poms by shorting out the electrical current in its palms. It uses these pom-poms to cheer on its teammates and will cry loudly if they lose. It climbs telephone poles to absorb electricity. It lives in grasslands and savannas. Plusle is often seen together with . As mentioned in Sleep Style Dex, Plusle has been seen waving its sparkly pom-poms while asleep. It is thought that Plusle dreams of cheering for others during its sleep. Plusle has four different sleep styles: Peaceful Sleep, Nodding-Off Sleep, Pom-Pom-Waving Sleep, and Atop-Belly Sleep.