Maybe I am stating an obvious one, but what about a King themed avatar.
Sometimes simple is best
King Tut
King HenryVIII
Lebron if you are a basketball lovin' ****
King James bible for the religious folk
King Taco
Paul The King of Big Screens
King of the Hill
I am the King of the World! (One could use Titanic or Michael Scott!!)
I am the Lizard King
Sofa King
King Kong
The Lion King (too bad Liewieke is no longer with the franchise, being he would be the perfect Lyin' King
and 100s of songs
It's good to be King
The King of wishful thinking
King of Pain (this would be awesome if we had an enforcer)