Sephiroth, Cloud and Aeris are my favorites so i'll choose (Hard to mae a answer) Cloud.
Why? Because he's just a perfect and great Hero, and his background and his attitude. He's just great.
Ok now i like Vincent but he's not even a main character you have to get, so how can he be so important? BtW all of the guys look hot in AC.
__________________
I vant to suck your blood