Shibuya Yuuri
Power of Maou/Leader/King: http://youtu.be/Lc4sTw7OuTM http://youtu.be/dl64ceacEy0
The Anthem and Song of Shinou: http://youtu.be/PDzxfnwZ-ok
Anthem: https://www.youtube.com/watch?v=PQotWs0VBZo
New Military Anthem 2 http://youtu.be/WnRHIhlBnT8

Mazoku literally meaning demon race is a species in Kyou Kara Maou that is born with unusual powers. They are closet what is known as "Demons" in English. The Mazoku in Kyou Kara Maou look completely human.
Only race that can use Maryoku which is the equivalent to Shinzoku-level Houryoku which are forms of "magic" many air qoutes there they really only called it magic because of the 27th Maou but they still used the term "magical" throughout all time