The title of Hand of the King (aka the Prime Minister of Westeros) fluctuates throughout the show, but for a chunk of it it's Tywin Lannister. I guess you could use him if you want.
Hand of the King: http://images6.fanpop.com/image/photos/35600000/Game-of-Thrones-game-of-thrones-35694620-2816-4240.jpg
Chicken: http://static.independent.co.uk/s3fs-public/thumbnails/image/2016/05/11/08/gothound.jpg
Squire: http://i.kinja-img.com/gawker-media/image/upload/idpsmi4g0gtuumlytgap.png
Oathkeeper: http://lovelace-media.imgix.net/uploads/112/3d04a1d0-0327-0134-e746-0a315da82319.jpg?
Lord Paramount: http://nerdist.com/wp-content/uploads/2014/07/ned-stark-970x545.jpg
Hand of the King:
The Iron Throne: http://www.likecroatia.com/wp-content/uploads/2014/06/Game-of-Thrones-Iron-Throne.jpg
So, here is my idea for the Game of Thrones badges
1 edit: Chicken
5 edits: Squire
10 edits: Ser
25 edits: Oathkeeper
50 edits: Lord Commander
100 edits: Lord Paramount
250 edits: Hand of the King
500 edits: The Iron Throne