Catulle said:
I rather thought the major mechanical issue would revolved around humanity and the beast (hence the Cthulhu). Control in vampire tends to decrease, not increase, over time.
Your mileage may vary, of course.
Humanity? Nah, that's not the hardest part. (Disciplines are hard, assuming you're using a class-/level-based system.)
In a nutshell, you can build it kinda like Alignment (D&D), the Dark Side (SW d20), and/or Sanity (CoC d20). Especially the latter two.
Heck, you can mostly lift it as-is from V:tM.
Maybe change the scale from 0-10 to 0-20.
Now, Virtues... You don't have to use Self-Control and Courage; that's what Will saves are for in d20. On the other hand, using them as a
modifier to Will saves vs. the appropriate phenomena would be pretty frikkin' cool. (I.e., a Self-Control/Courage score of 2 gives no modifier; 0-1 gives penalties and 3-5 gives bonuses. 'course, the scale might be different from 0-5, in a d20 game.)
Which leaves Conscience. Now, if you use the other two, just use Conscience as well.
Otherwise, just assume a default Conscience for everyone (e.g., +0) and create a feat that gives you a bonus to Conscience rolls.
(In any case, Humanity is a limit to the
effective Virtue ratings- just like in V:tM.)