This is One of my Favourite Animation
Nike is a 4th Princess in another country.
She is No push over.
She is strong will, fun, kind.
She balances the Sun King out.
He is a Kid with an Adult Mind.
This Animation does address the age gap in many episodes but I love it when he tells Nike that for now he is this height but he won't stay this height forever.
They do care a great deal for each other , they respect each other and becomes friends.
Nike makes him a better King.
You do find out that Nike Grandmother wouldn't have sent Nike to marry the Sun King.
Nike was supposed to take over the Grandmother job as leader one day.
I just loved it.