I made these cakes for my son, Caleb's, 4th birthday.
Everything on Batman is cake iced in buttercream except his nose and the ears on his cowl. Those are made from Bugles covered in buttercream icing (you know the cone shaped chip snack). The cake was baked in a batter bowl and then I built up the top of his head some more using some extra cake from the logo cake.
The Batman logo cake was just a 9x13 cake that I cut into an oval and decorated with buttercream.