Tertius, third prince of the small northern kingdom of Septevia, attends Eden Academy with foreign dignitary status, assigned to Specter Hall. Behind the rehearsed poise of royalty hides a boy who scares easily, and his habit of reading international crisis into ordinary schoolyard mishaps drags him into one comic misunderstanding after another.
Four stiff spikes rise from Tertius's straight blond hair, forming a silhouette that faintly suggests a crown and quietly signals his royal lineage. His eyes are a pale blue and his grooming immaculate. At school he dresses in Eden's standard boys' uniform, pairing it with black shoes and socks patterned in diamonds and vertical striping.
Brought up to embody chivalry and princely dignity, Tertius works hard to project the image of a strong, dependable future leader. The calm confidence he shows classmates is largely theater; underneath, he frightens easily and spirals into overthinking. His courteous manners have nonetheless won him admirers among the girls in his year.
His greatest quirk is a tendency to inflate trivial incidents into affairs of state. A classroom slight becomes, in his imagination, a test of Septevia's honor before Ostania, and he reacts with dramatic declarations that baffle everyone around him. He backs down just as quickly once a misunderstanding clears, apologizing sincerely and even inventing a legendary Septevian jewel as a reward for Anya, then interpreting her skepticism as tactful kindness.

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Born the third of Septevia's princes, Tertius endured strict swordsmanship lessons from his steward, who pushed him to become a leader capable of standing before great powers without flinching. He began his first year at Eden Academy under foreign dignitary status, and a weak Science grade after finals dropped him into the Class F science group for the second term.
There he meets Anya Forger. When a stray booger flicked from Freddy's finger lands on his face and the boy keeps grabbing at it without explanation, Tertius convinces himself he is being hazed, escalates the moment into a matter of national pride, and issues a terrified challenge. Anya's intervention, and a flower poke that unknowingly removes the offending speck, dissolves the standoff. Won over by what he takes for her selfless discretion, he befriends her and Freddy, walking with her to class, showing off a Northern Gull pen from home, and inviting her to visit Septevia over the next break.
Later, rumors of the Devil Ritual among Eden's Seven Great Secrets pull him into exploring the forbidden old schoolhouse with Anya's group. He spends the expedition on the edge of panic, screaming when Bill Watkins appears without warning, and that night he is too rattled even to visit the bathroom alone. His reflexes are surprisingly quick when startled, and he excels at Classical Language, earning Class A placement, though his marks remain inconsistent across subjects.
Tertius befriends Anya after mistaking her intervention in a schoolyard misunderstanding for selfless discretion, and he rewards her with an invented legendary Septevian jewel and an invitation to visit his kingdom.
Tertius is the third prince of the small northern kingdom of Septevia, a foreign dignitary student at Eden Academy assigned to Specter Hall.
Tertius works hard to project princely calm and dignity, but underneath he frightens easily and tends to blow trivial schoolyard incidents into imagined matters of national honor.
Tertius excels at Classical Language, earning Class A placement, though a weak Science grade dropped him into the Class F science group for his second term.
Tertius joins Anya's group in exploring the old schoolhouse rumored to host the Devil Ritual, spending the whole expedition on edge and screaming when Bill Watkins suddenly appears.
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View on FandomThis content is original writing by Daddy Jim Headquarters based on the Spy x Family anime series, manga, and official materials. Spy x Family was created by Tatsuya Endo, published by Shueisha, and animated by Wit Studio and CloverWorks. All rights to Spy x Family and its characters belong to their respective owners. Episode and chapter references are cited where applicable.
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