When it comes to rpgs one of my favorite things is designing my character, pouring over all the options, tweaking this and that and getting them "just right" for myself. I can literlaly spend hours making a character before I even start the game.
One of the things that can GREATLY help wit this is the ability to "save" a character's looks.
Some games allow this, from Bioware's Mass Effect, to mmorpgs like Final Fantasy XIV: ARR, where you can save the characters look before you get into the game, so if you find something "off" or wnat to change something small you can.
This also makes it super easy for people to be able to share character designs with others. Having very talented people who can make good looking characters and then being able to share them with others is great, especially for people who aren't that good at it and can simply go to the forums and browse threads for characters, find one they like and just plop the code into their game to get that look.
Also I hope that the base game will have a way to alter your appearance post-character creation, like in both Fallout 3 and NV (NV required Old world blues IIRC). Being able to change your looks after a while is a very welcome design choice.