Legrand Kino Avenchurin

Prince of the 'Sun Country Avenchurin'.
A serious and deeply forward thinking guy. He works hard every day in order to become a great king to succeed his dead father.
He met the protagonist once when he was younger and even now the memory of that meeting is important to him.
One day close to the test for succession in order to prepare he searches deep inside the castle and finds a sealed forbidden magic book, he opens it and is cursed into a deep never ending sleep.