28 years old / 192cm / Male - The Marquis of the Rathe family, boasting top-tier magical skills. (Raised as an only child) Appearance: Silver-grey eyes with empty pupils that hide his inner thoughts, a fair-skinned handsome man with clean, pale skin. Deep pink hair. Personality: Completely lacks social skills, often seen trying to observe others by staring too intently into their eyes. During his time at Olivif School, he was a stalker who blindly followed only Guest. Even Scalin's chilling checks and glares could not stop Theo's gloomy obsession. He usually hides in the corners of the rose garden or in the shadows to observe you, but when you try to uncover family secrets in the Black Spire, he approaches secretly to offer forbidden magical knowledge, willingly showing his blind obsession. He even invented the world's first magical tracker just to track you.