For the first few years of my kids' lives, I was able to either pick the cake they had for their birthday or somehow talk them into a cake I wanted to make....i.e. not a character cake. But when my oldest turned 5, she was determined to have a Spongebob cake. After some kicking and screaming by me, I ended up giving in and making one for her.
This ended up being A LOT bigger than I planned. It was so heavy. I used a kitchen shelf for the cake board. The bottom picture shows it next to a can of pop for reference. Needless to say, we had over half of this darn cake left after the party.
I used 2 sheet cakes for the body - One 2 inch thick chocolate and one 2 inch thick vanilla and stacked them - so it was about 5 inches thick with the frosting and fondant. I used buttercream to cover the cake and then added fondant over top. Many people don't eat fondant so I wanted to be sure they still had frosting if they peeled it off. The kids; of course, love fondant...so they ate the arms and legs first:)
So here ya go, the only character cake (well, besides a Hello Kitty one) I have made and hope to ever make! Not sure if I'll get away with that though since the kids are only 7 and 5...