Willi is the youngest one out of the three brothers you meet in the Easter 2012 special episode. After revealing a prank Willi and Wenka pulled on their oldest brother Charli, Candy eventually befriends them and returns home to her own world. Willi gives Candy his chicken as a tank you gift before you leave, and you can wear it as a clothing item on your hand. After you leave, you see two rabbits in the forest with similar appearance traits to Willi and Wenka.
Willi has short gray hair with a pair of gray rabbit ear, and grey eyes. He wears a grey hoodie with a blue collar and ripped black pants. He is usually seen with a chicken on his head.
Willi is smart and serious for his age, but is also prone to mischief and childish pranks together with Wenka. He is also a bit snarky.