Miyabi, I'm trying to set this up in a very simple and loose RPG system called Risus, found here: http://www222.pair.com/sjohn/risus.htm. The actual rules (all 6 pages of them) can be downloaded here: http://www222.pair.com/sjohn/free/risus-1p53.zip.
I'm using these rules options: Pumping, Hooks and Tales, and Funky Dice.
Pumping I'm using to represent flaring. Pumping allows you to increase the dice you use for a roll, with the risk of losing more dice than normal. (If you lose all your dice in a cliche (stat), you lose the contest/conflict.)
The Funky Dice option sets normal humans at 60 points (10d6; 10x6=60). Points are used to buy dice for cliches. (Here is where my original question comes in.) If Vin is approximately 2x more powerful than a normal human (when burning metals), then she is a 120 point character. IF she is 10x more powerful, then she is a 600 point character.
BTW, for Duralumin, I'm making it an automatic Pump of all the dice in the Mistborn cliche, so it doubles the strength, and doubles the dice loss if the roll fails. Also, since she doesn't seem to be as skilled (less finesse) at Zinc, Brass, Atium, and Gold, I'm dictating -1 die for those rolls.
I hope that wasn't too detailed/technical. But that is my dilemma.