After going through a fairy phase, Arthur became fixated on being a "super why." (This is some sort of superhero character on PBS that saves the day by spelling words.) If you know Arthur, you know that once he's fixed on something, you either give it to him or endure a long painful tantrum that makes you wish you'd given in. So I came up with a pretty cool superhero ensemble on the spot (if underwear on top of Adaline's tights, pants for a cape, and goggles for a mask is cool). He spontaneously came up with superhero poses, of which I thankfully caught a few on camera.
I happened upon the pirate idea during this process. It was just too cute to pass up so we convinced Adaline to be a pirate by telling her that we'd make her a sword which would make people give her more candy. She's very candy-motivated, so we avoided the usual princess/fairy that we assumed she'd be. Her "Argh!" was quite convincing and cute, although the construction paper eye patch was never on her eye.
Here is the final product, followed by the test runs:
Oh, and they had a blast all night!