The backstory for this superhero involves an early adoption and a kid growing up quite normally until her 16th birthday dinner when she felt a bit sick and visited the restroom - only to have the bathroom furniture spout water and ultimately explode around her as her powers made themselves manifest! Fortunately they then remained quiescent again until she went to college, but there she fell in with a bad crowd and turned to petty crime... until one of her superpowered crime partners decided to attack her adoptive parents. A massive battle ensued, and after defeating him, she turned herself in and did her time for the offences she'd committed.
Now a reformed character, she brawls on the side of good. Her powers include probability manipulation and the ability to change the colour of an item, and she has also taken to the study of magic.
Hex is an interesting character with the potential to walk on either side of the street as superhero or supervillain. She'd be quite interesting to play or to use as an NPC associate of the party, with a backstory that can - and should - intrude into the plotline every so often.