I would like to see Mini-me, basically a small copy of your character.
Wouldn't need to be called Mini-me, could call it a doppleganger or some other sort of Mimic named creature. I would still name it Mini-me though.
My other thought was mini Breanni! Some variations could be done like depending on the season she'll be dressed differently... like summer she'll pop up dressed in a bikini holding a drink and complain "this better be important, I was on the beach grabbing some rays!" Would even be cool if she sold stuff like she does in Dalaran. One of her ability skills can be something like Random Rush, sends like 9 random pets from your collection that each do a small chunk of damage.