Louis Valentin

Louis Valentin (ルイ・ヴァレンタイン), the Pope Emperor of Ruberios is a subordinate of Demon Lord Luminous Valentine and her proxy in controlling the citizen of Ruberios, while his twin brother Roy Valentin plays the role of the evil Demon Lord to unite the populace of Ruberios under Louis.

Trivia

 * Both Roy's and Louis' first names, as well as their surname, are pronounced in French.