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Thievul is an orange-maroon vulpine Pokémon with a moderate build, slender limbs, and a long tail. It has white chest fur that puffs out from its body and vaguely resembles a cravat, long black ears, black fur around its eyes resembling a domino mask, black whiskers in the form of a pointed mustache, and white markings above its eyes resembling eyebrows. Its paws, back, and the tip of its tail are all black, and it retains the flared tail-tip of its pre-evolution Nickit.
When it finds a potential target, it will secretly mark a scent on them. Thievul uses that scent to track and stalk its targets. By using its lithe body and claws, Thievul steals the foods and eggs from them when they least expect it. Boltund is an enemy of Thievul. It competes with Liepard for territory.
Thievul appears to be based on the red fox. Its facial features and mustache-like whiskers also bear a resemblance to stereotypical depictions of thieves and burglars, as well as the gentleman thief trope. Its front legs resemble gloves, which thieves and burglars would have to wear.
Thievul may be a combination of thief, evil, and vulpine.