Only my imperial shield and sword guy and my breton battlemage wears heavy armor.
While my rogue,archer,dual swords guy and my main, a nord with two handed wears light armor.
My regular typical mage wears robes though.
I am sure i am not the only guy who prefers light armor over heavy armor, right?

I've always played a Heavy Armored Nord as my main character ever since Morrowind (Morrowind had the Nordic Mail which was great - Oblivion I chose the Crusader Armor for him).
I like to dress a character in an armor to suit their race and built their stats to suit. I end up having multiple other character builds.
Nord in Nordic (dragon plate in Skyrim's case),
Imperial in steel plate / ebony,
Bosmer in Elven
Orsmer in Orcish
Redguard in Hammerfell garb or Dwarven
Breton in Forsworn or robes,
etc etc