This might be something that's really cool to find out in game rather than on forums so here's a spoiler warning
I am going full dark side and you really get to know how your character looks because of the many conversations etc.. Well I just realized his eyes are changing color due to him turning more and more evil the more dark deeds i do. This may seem like a small thing but when I realized this in game I was blown away. It's things like that which separate this MMO from others. What you do and say actually has consequences for your character. I've reached Dark level 1 so his eyes went from grey to a glowing orange.