Dude, I have to totally agree with you about Treize being the best character. That's been my opinion since the first time I saw the series. Treize takes on the role with the most burdens and is always able to pull out success. My favorite part though is when he pilots the leo in...i think about episode 19...I don't have my dvds with me right now but when Tuberov is showing off the mobile dolls and Treize comes in in a suit to represent the soldiers they plan to replace with the dolls and shows off just how much importance he places on humanity, that and how he always controls everything happening in the series.
Whats more, he is one of the only main characters to actually die at the end of the series WHICH IS THE MOST DEPRESSING THING OF THE WHOLE SERIES.