William is a Cinnamon Rabbit character existing solely within the Sylvanian Families franchise. He is romantically partnered with Stella Chocolate, a Chocolate Rabbit. Their relationship originated from a meeting at the Grand Department Store. William's courtship began as a secret admirer sending Stella bouquets of flowers and gifts, evolving into a mutual and public partnership.

Characterized as kind-hearted and romantic, William possesses interests in art and music. He demonstrates a consistent dedication to spreading joy, actively creating surprises for others. His friendly nature is evident through warm daily greetings exchanged widely within the community.

Official merchandise presents William in formal attire. His initial depiction features a red suit. Subsequent portrayals show him in coordinated Liberty print ensembles with Stella, specifically designed for garden party scenarios. While Stella's garden party outfits offer multiple styling options, William's attire maintains a consistently formal appearance.