Something quick and simple off the top of my head. Any such actual game version would work differently apart from the rating scale.
Mortal: 1-4
Heroic: 5-9
Olympian: 10-15
Numbered: 16+
Ego = Insight
Average of Prowess and Might = Fitness
Fortitude = Toughness
Treat powers as powers, given a rating equal to the corresponding ability.