A Doppelgånger

A doppelgånger is a tangible double of a living person in popular culture that typically represents evil.
So Emma has an evil twin? Or as Emma is very naughty is she the evil twin? All I know is that many times this season I and many others have mistaken Katie from Supertravel for Emma from Powder White. Even down to clothing they appear to shop at the same stores. With the sun out their choice of aviator eyewear was the same. One had silver rims, the other gold.