Ariel Cookie (Korean: 에리얼 쿠키, elieol kuki) is a Guest Cookie released in the Festival of Dreams & Wishes update (version 3.4.002).

Ariel Cookie has left the warm embracing ocean to explore the toasty lands of the Cookie Kingdom. She made a bunch of friends in the Tropical Soda Islands: some with fins and some with legs! What new gadgets and gizmos will Ariel Cookie find in this adventure?

Ariel Cookie is one of the 20 first Cookies released in the Guest rarity. Ariel Cookie is the first Cookie to walk on water tiles. She has a unique set of overworld animations for this, changing from her human form into her mermaid form. She retains this form while interacting with any water decors. A player must drop her on an interactive water/land decoration to have her swap forms. Ariel Cookie's internal name is "cookie0559."