Fishabel, scratch cheesecake sounds divine! I would be pretty afraid of using it in the so cal heat though, specially with fondant. Even in Oct here the weather remains pretty warm. Using cheesecake would be something I would want to tinker with before using for an order.
Funfetti, The cake is to be decorated with fondant in a dr. suess design. She has already decided on a fruit filling and is happy with my selection of cake flavors. It just the buttercream she doesnt like which is what I normally use under my fondant.
Fireandice, I have never worked with marzipan to cover a cake. I had tried some once and was not a fan personally. I don’t think its used all that often in the US.
Thank you all so much for your suggestions! They really are helpful and are opening my eyes to all the options out there I need to learn still! :)