How to raise replayability? How to make your warrior more different from previous one?
How about bringing character outfit dependancies on allingment, even on his actions?
Idea is not new and unique, it was first implemented in Black and White.
In two words, the more good things you do, the more quests you solve in a good way the better you become. You start to look like a nice person, in bright colours, with positive face animations.
You know all those attributes in character outfit that make you decide whether character is good or evil.
And vice versae the more evil things you do the more evil-look you become, having eyes glowing with hate, prolly dark-red skinned, with lightnings sparking below your head.