Someone who is as swift as a coursing river
With all the force of a great typhoon
With all the strength of a raging fire
Mysterious as the dark side of the moon!
In all seriousness though I think I would have to say someone who:
1. Accepts responsibility - Not only for their actions, but also who takes up an effort to do what needs to be done.
2. Rejects passivity - Someone who stands up for what they believe and does not sit by and let things happen.
3. Respects others - Shows respect to others regardless of what they believe, their gender, social status, etc.