Having played Guild Wars byNCSoft, I must say the cloaks/legion tabards look very similar.
Guild Wars also has WASD movement and instancing.
1. Character class profile customization also very similar to GW, where you can "merge" warrior with secondary class as priest for example or something else. So in Aion you can acquire secondary skills in stigmas to customize your toon.
2. On a graphic side I also noticed many similarities.
Dyes to change armor appearance slightly, adding lines or shade-just like in GW.
3. Tamplars look just like GW warriors. Many armor types I noticed look like Kurzick armor.
