Timmy, Cosmo, and Wanda From The Fairly OddParents
What to wear: For Timmy, you need a pink shirt, jeans, and a hat that's way too small for your head. For Cosmo, you should spray your hair green and wear a white button-down, a black tie, matching slacks, and a gold crown. For Wanda, you should don a similar look by spraying your hair pink and wearing a yellow t-shirt, black pants, and a gold crown.
How to act: The three of you should sing the show's theme song to random strangers.