I think you should be able to Personalize (is that a word?) your character really much... Like how your face looks, and your hairstyle and color, and how long/short you are (With some limits, depending on the race) and fatness, If you are really big, or just really thin. (some limits here too), and your muscles, if you are strong, or weak. And then, when you play the game, and fight much, mine much or something else, your muscles grow!
The thin, fatness, little muscles, big muscles could be at the \'Advantages/Disadvantages\' screen. Like if you are strong you get more Hp and hit harder, but you need to take a disadvantage too! (like unlucky, or something)
And then I think you should be able to \'cuztomize\' your characters clothes. Like, if you are in a clothier and want some clothes, you could decide colors and how big they are, and the looks. And if you want a long or short arm-length on the clothes arms, and such.
All this things maybe cant make it into the Game engine,
but anyway I think its some good ideas... :/
(This could have been posted earlier, but i dunno :/)