I made this cake for my daughter who loves Hello Kitty but then, it may be all because of me since I grew up loving and owning anything, Hello Kitty. She was very adamant about having specific characters on her cake: Tammy (monkey), Keroppi (frog), Pochacco (dog), and My Melody (bunny). I had made all of the characters except for Tammy through one evening, and when showing them to her the following morning, she asked right away, "but where's Tammy?". I did get it made that very evening.
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The cake was 2-tier with 9" and 6" rounds, both Strawberry and Vanilla Marbled Sour Cream Cakes, filled with fresh strawberries and covered in Strawberry Italian Meringue Buttercream (IMBC) - it smelled and tasted delicious! The recipe for the IMBC is posted under the last cake I did, the 80th Birthday Music Themed Cake. All the decorations were handmade with marshmallow fondant that was mixed with GumTex (Tylose Powder) to help the fondant dry fast and hard.
I traced out each character over a piece of parchment paper and used them as a stencil to hand sculpt and mold each character. With a little bit of shortening on your fingers, you can rub each piece of fondant as you smooth and shape them (just like when I made the teeth on this denture cake). Use a little bit of either water or piping gel as glue to adhere each piece to one another.