He has blond hair, blue eyes, and thick eyebrows much like England's.
Due to the fact that he isn't considered an actual nation, none of the others take him very seriously. However, Sealand believes that someday he will become a huge empire that even his brother will bow down to.
Like his fort, he is actually made of steel and can fire a "Rocket Punch" that he believes is super powerful (though in actuality he can only do so when dressed up in a kids' mecha costume).