Louis Valentin

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

Appearance
Being Roy's twin brother, he holds an identical appearance to him. Due to his duties as holy emperor, he usually spends most of his time in priest robes.

Personality
Like all of Luminous' servants, he is fiercely loyal to her. When Luminous grieved Roy's death, Louis emphasized to her that Roy's death wasn't her fault and that it was due to his weakness.

Background
There was once a powerful and bloodthirsty Vampire known as "Valentin," who was known for being highly bloodthirsty and battle crazed; even after being subjugated and taken under Luminous' wing, he continued to antagonize her other subordinates, forcing Luminous to use her powers to divide him into two separate beings. Creating both to be her stand-ins; Roy acted as her proxy on the demon lord council, and Louis acted as the holy emperor for her human empire.

Abilities
Being the "Twin Brother" to Roy, later revealed to be two separated halves of the powerful Vampire "Valentin", Louis likely possesses all the abilities and skills identical to his brother and other vampires of similar rank and age.

As seen during his fight against Laplace, Louis' power was shown to have doubled and increased due to his having reabsorbed Roy back into himself.

Trivia

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