Which ingredient is NOT in a Banshee cocktail?

The Banshee cocktail is traditionally made with cream, clear crème de cacao, and crème de banana. Cream provides a rich and smooth texture, while clear crème de cacao and crème de banana contribute the cocktail's signature flavors.

The inclusion of vodka in the cocktail is not standard as the other three ingredients create the desired taste profile without the need for any additional spirit. Vodka would change the nature of the drink, making it less creamy and altering the balance of flavors that the Banshee is known for. Therefore, vodka is the ingredient that is not included in a typical Banshee cocktail.