The more possibilities there are, the better. That's an obvious choice.
Agreed.
All players LOVE to personalize things. Makes the character more of THEIR character.
Edit: WTF. Where did MY post go? I guess the mods are trying to keep these threads dead, can't blame them.
Just a recap:
In Soul Calibur 4 you could change the colour of your armour using a Colour Palette, which was way easier than the sliders from Facegen. Same deal with eyes, hair, skin, socks, even underwear. The colour palette contained all possible colours, brightness, and Saturation. Along with that there was 1st 2nd 3rd and even 4th colours.
You could combine all sorts of armour and clothing from socks, underwear, shoes, greaves, chest plates.
You could chose from a number of preset voices with pitch correction.
Lastly there was muscularity and physic sliders. Muscularity would add darkening of skin in obvious areas to make the character look muscular, and physic would increase their bulk.