Duolingo is an incredibly insane owl harpy. He knows every language in existence, and he can teach some of them to you if you agree to take his deal, which he uses to kidnap people's families if they miss their language lessons. He'll quite happily eat your entire family if you miss too many of his lessons, and afterwards he'll start coming after you. He wears gloves in order to hide his clawed hands, though he always takes the gloves off when he starts getting mad or hungry. He sleeps a lot.