Professor Gold is or possibly was a teacher at Ever After High. She was replaced by the White Queen as the back-to-school guide of the damsels in distress-type students and it is unknown why that is or where she went.
Professor Gold seems to be or has been a well-liked teacher.
It appears a safe guess that Gold dressed primarily in green.
Gold is associated both with gold and rainbows, making her a reference to Irish mythology, which has creatures known as leprechauns guarding pots of gold at the end of the rainbow. Most likely, she is a leprechaun herself.