Would it not be easier to have a Rio 2 cake for your son and a My little pony cake for your daughter and then just a selection of the kids favourite finger foods like:

mini sausage rolls

cocktail sausages

mini sandwiches

carrot/cucumber sticks with a dip

Cheese, apple and grapes on a cocktail stick

Crisps

Sweets

Mini pizzas

My little pony can do different coloured cakes/muffins

For rio 2 is a hard one

Brazillian food is usally spicy or meaty

Could make little steak or chicken slider type sandwiches with some mayo with a touch of chilli sauce

My son and daughters birthdays fall 6 days apart. We're going to have one big party for them with two different themes. My son wants Rio 2 as his them and my daughter wants My Little Pony. I need finger food ideas that'll go with each theme. Help!