I've got the tiefling sorceress angle covered with the draconic bloodline as to how she got her magic, but only half a character sheet finished.  Had a pretty bad headache when I got home yesterday though so I'm hoping to get that done later today.  I have it in my head she was a noble before she accidentally exploded with magical fire and burned everything down around her, including her family lol.  She didn't feel too bad about it though, and while she's on the run, she's far more interested in her new bag of tricks.  It was an arranged marriage she wanted no part of is what set her off in case anyone's curious.  ;D