Roxi has been talking incessantly about being a princess for Halloween. Rob offered to build her a state-of-the-art robot costume, but no dice. It was princess, princess, ONLY princess. However when we got to the costume store, she immediately fell in love with the Supergirl outfit. I think the shiny cape clinched it.
Gib, for his part, has heard Roxi talk about being a princess so much that he desperately wants to dress up as a princess himself. I got him a Superman costume thinking it would change his mind - getting to match Roxi, wearing a cape, etc. Not so much. He loves the costume but insists that he is NOT Superman when he wears it, he is Super Princess.