Edit: Just finished the pic. Didnt take long. Anyway here my take on the two timing character.
Double Trouble in my view is more of a Sorceress of Etheria who is given the secret responsibility of maintaining balance between Good & Evil on Etheria by some higher force. With the Medallion of Change attached to her staff she can easily transform her attire to suite either side.
On a side note, this pic shows both sides of her transformation attire. In the toon I imagine her sticking to either one of them.