Spero

Spero (His human and real name is Vis Pacem Parabellum) is the tritagonist of Discordiae Votum and one of the central protagonists (and formely antagonist) of Zetsubo-zen.

Spero is a mysterious Meowstic who has trouble about remembering his past, he was found in a chest in the middle of a snowy area by Helena, she rescued him and could prevent Spero from dying of hypothermia.

Actually, Spero was a human named  Vis Pacem Parabellum and was part of the Original Sötét Démon and part of the Disharmoni Royal Family, he commited massacres on the Disharmoni Kingdom and was the one who invoked Meurtrière, Meurtrière attacked Spero and replaced his memories with fake ones, making him think he was a Pokémon abandoned by a criminal in the middle of nowhere.

Although this would bring consequences for being one of Darkrai's Followers, his sins were forgiven along with Kanojo.

Personality
Spero has the typical personality of a Meowstic, serious, competitive, unsociable and keeping a stoic, virtually emotionless face, he only shows his true emotions when it's with people who he trusts, becoming kind, polite, outgoing and serene when he feels safe. He can be paranoic sometimes for unknown situations. He has shown great intelligence and a great sense of logic.

As a human, he had a selfish, ruthless, nihilistic, cruel and sadistic personality, he had an ardent hatred of existence and the world for the life he had, being part of a family of royalty and not receiving inheritances or luxuries.

He had no remorse when murdering or causing harm to people, his hatred has corrupted him so much that drive him into insanity.