In a large mixing bowl, whisk together the instant banana pudding mix and the juice from the crushed pineapple until smooth and thickened.
Incorporate the Cool Whip:
Fold in the Cool Whip until well incorporated, creating a fluffy base for the dessert.
Add the Fruit and Mix-ins:
Add the sliced bananas, chopped strawberries, mini marshmallows, maraschino cherries, chocolate chips, and chopped nuts to the bowl.
Gently fold the mixture until everything is well coated with the banana pudding mixture.
Chill the Dessert:
Refrigerate the mixture for 2-4 hours to allow the flavors to meld together and the dessert to set.
Garnish and Serve:
Before serving, garnish with additional chocolate chips, chopped nuts, maraschino cherries, dollops of whipped cream, and sprinkles for that classic banana split look.