Luka

In The Testament of Sister New Devil, Luka is an extremely minor background character. Because of his very limited screen time, he has no official character biography, developed backstory, or documented personality traits in either the light novels or the anime adaptation. Strictly speaking, Luka does not have a personality. He serves entirely as a functional background character or "extra" to populate scenes in the Demon Realm. He does not display any personal motives, temperaments, likes, or dislikes throughout the series.