I'll have to admit, my two boys haven't went through the YO GABBA GABBA! phase, so this show and all it's characters were totally new to me. I still haven't learned all their names, but I do know that Connor likes them and wants to celebrate his special day with them! This cake is vanilla with vanilla buttercream, and serves 25 people. I sure hope you like it, Connor, and a special thanks to Mrs. Wanda and Tasha. Happy birthday, Connor!