Ok, so admittedly I discovered this a bit late this season, but there's still plenty of 24 to go! Apparently the site Watching 24 has started doing a character countdown this season. They start all the characters with 100 points at the beginning, and then different events in each episode determine whether the character gains or loses points. The way it's setup right now is not very conducive to a fantasy game, but I'm sure their system could be used somehow as the basis for one.

My favorite ones? (spoilers below!)
Sandra Palmer: (-2)
-Didn't show up in this episode (+10)

Net Gain/Loss: +10
Current Total: 8
and
Special Awards:

(-100) points to Marylin for not telling Jack about his Dad, and almost getting him blown up in the process.

I especially agree with that last one.