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Wandering around in GW2 I am seeing a lot of muscle bound avatars running around, not to mention the Miss World contestants look a likes.
Having a great looking avatar is great but wouldn't it be an awesome RPG element to be able to only have a really fat or skinny avatars from level 1. Only then to gain some sort of points that allows you to tweak your avatar gradually through the levels so that by mid to upper tier they are super athletes? (Add a bit to the bicep, shave a bit off the thighs)
That way a player can show off their avatar as well as their gear/clothing and you will feel that the avatar has grown through their journey as well.