How would you define a "complex person"?

Question:

How would you define a "complex person"?

I could look it up in a dictionary but that would take all the fun out of the quest.

Best Answer - Chosen by Asker: Someone who has to think everything through, weigh every option, debate every topic, etc.
On top of that, they exhibit every possible emotion at completely unpredictable moments.
And, they have a huge number of interests and must dabble in all of them.