Who is the most complex character ever created?

[Carl]

"When I say complex, I mean a character that feels almost truly human, that has many issues going around him that make him act in very unpredictable ways."

If doing it this way, IMO the best answer would be Jowy Atreides from Suikoden 2.

I'm not going to say why, because of spoilers, but yeah... He is my answer.