Mermaid Cupcake Filling

Brianne • Mother of two beautiful baby girls. Scarlett Danielle and Winsley Ann 🌼
We are doing these cupcakes for my daughters birthday party! The tail will be made out of a marshmallow fondant, frosting will be Swiss buttercream, and the cake with be white. What sort of filling should I choose?  Should I also do a chocolate sheet cake to make everyone happy? 

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