This section temporarily contains information copied directly from Bulbapedia, and needs to be rewritten so not to be classified as plagiarism.
Quilladin are bipedal, mammalian Pokémon with some plant-like features. They are largely covered in an armor-like shell similar to that of a chestnut. The armor is green in coloration with two large spines jutting out like ears. These spines and their pointed tails have red tips, and there are banded segments on the back of the shell. The lower half of the body is brown, and they have a three-pointed patch of fur decorating the front. Their stubby limbs are brown, but the top surfaces of the arms are protected by green, banded armor. They have three white, clawed digits on their hands and two on their feet. The face is exposed and unarmored, being light brown in color. They have a small, pink nose and a pointed snout, with a three-pointed patch of brown fur extending out like hair. Brown triangles mark their cheeks. They also have wide eyes, buck teeth, and usually wear a cheerful expression.