Osivia

Biodata

Feature	Details
Name	Osivia Hsin Romanov (奥西维亚) 95
Alias(es)	Professor Romanov; Headmistress Romanova 95 402
Species/Race	Human witch; capable of serpent-based human Transfiguration 77 121
Gender	Female
Affiliation	Slytherin; Hogwarts; Durmstrang 71 95 403
Occupation/Role	Former Slytherin graduate; Transfiguration professor at Hogwarts; acting Headmistress of Durmstrang 95 403
Status	Active 414
First Appearance	Chapter 70, “Fresh Graduate” 70

Background

Osivia is a Soviet witch who identifies herself more specifically as Ukrainian. At eighteen, she had recently graduated from Slytherin when she met Hoffa Bach at Twin-Horn Cape after receiving a letter from Headmaster Armando Dippet. Her initial assignment involved a confidential mission in Morocco, while Dippet had also tasked her with protecting Hoffa. 70 71 80 113

Her underlying objective was to locate keys to the Forbidden Arts Library. Sylby’s claim to possess one of the three keys drew her into escorting him across Spain, despite her distrust of him and his constant provocations. 80 81 89

Osivia’s pursuit of the library was intertwined with revenge. A mysterious man had shot her brother and father, and she initially believed Dippet to be the Half-Human King responsible for the wider conspiracy. This belief drove her to attack Dippet and duel Hoffa beneath the Hogwarts hospital. 119 120 121

After the truth about Sylby and the Forbidden Arts Library emerged, Osivia apologized to Hoffa for her past conduct and abandoned revenge as her central purpose. She later returned to the Soviet Union to assist her father. 124 134

Years later, following Headmaster Urigin’s death during the Sleeping Plague, Durmstrang asked Osivia to lead the school. She accepted as acting headmistress while pursuing her own hunting plans. 403

Appearance

Osivia is a tall, strikingly pale woman with a high nose bridge and deep green eyes. Her appearance is consistently severe and meticulously arranged, matching her controlled demeanor. 70 95

• Usually wears dark green or purple wizarding robes with high black leather boots. 71 95
• Keeps her hair in a tightly pinned bun secured by several hairpins; later wears it loosely coiled to one side. 70 134
• Wears a green snake necklace that can unravel into numerous snakes. 79
• Her serpent transformations can enlarge her into a giant snake or a half-human, half-serpent form. 77 91
• In combat, she can transform much of her body into living metal. 121

Personality

Osivia is initially icy, austere, and intensely private. She speaks little outside subjects she considers important, approaches assignments with absolute seriousness, and treats safety rules as obligations rather than suggestions. Her protectiveness toward Hoffa initially manifests as controlling behavior, including attempts to confine him to a hotel rather than let him take dangerous work. 71 74 80

She is practical, disciplined, and highly self-reliant. During the journey through Spain, she leads the group through hostile territory, gathers food and medicinal plants, treats Sylby’s illness, and remains focused on reaching Barcelona despite repeated attacks. 86 89

Osivia also possesses a violent temper and a capacity for ruthless force. Her obsession with revenge causes her to lose control in Barcelona and later attack Dippet before the evidence can be properly examined. Her defeat by Hoffa and the revelation of Sylby’s deception force her to confront this fixation. 91 120 121 134

By her later time at Durmstrang, she has become more openly affectionate toward Hoffa while retaining her strictness and sense of duty. She views her political engagement to Vladimir as a family responsibility rather than a romantic choice, but admits that she misses the simpler days she and Hoffa spent travelling together. 402 404

Abilities & Skills

Transfiguration

Osivia is an exceptional Transfiguration specialist who teaches the subject at Hogwarts and later leads Durmstrang. She emphasizes control, understanding, and precision over overwhelming magical output. 95 106

• Transfigures ordinary objects with ease, including turning Dippet’s letter into a hairpin. 70
• Creates terrain obstacles, disguises, weapons, restraints, and protective structures in combat. 77 86 120
• Uses Human Transfiguration to alter her own body while retaining control and awareness. 106 121
• Can transform an arm into living metal while preserving neural activity, then extend the transformation across much of her body. 121
• In the Mirror World, has difficulty seeing her surroundings clearly and relies on Hoffa to guide her. 108

Serpent Transformation

Osivia can transform into a giant snake or assume a half-serpent combat form. Her serpent magic is a defining part of her combat style and mobility. 77 91

• Transforms into a giant green snake for pursuit, travel, and swimming. 77 89 114
• Uses her tail to rescue Hoffa from the Black Lake and carry him to safety. 114
• Generates or commands snakes to block paths, form nets, track opponents, and create layered defenses. 78 106 120
• Assumes a wounded but formidable half-serpent form during the battle at Barcelona Sants Station. 91
• Her snake-like senses can locate opponents concealed by ordinary Disillusionment magic. 120

Spellcasting and Combat

Osivia is an experienced combat witch whose skills suggest specialized Auror training. She is willing to use lethal force against immediate threats. 86 88

• Apparates herself and companions out of danger, including during the escape from Granada. 86
• Casts the Imperius Curse skillfully enough to compel soldiers to let her group pass. 86
• Uses Shield Charms to deflect attacks and protect herself in duels. 106 120
• Employs offensive spells such as Earth Spike and lethal green spells while leading Durmstrang wizards in battle. 119 414
• Killed a Construct Wizard assassin by constricting her in serpent form after the assassin attacked Hoffa. 88

Leadership and Instruction

As an educator and later acting headmistress, Osivia applies the same demanding standards to others that she does to herself.

• Pushes Hoffa to develop a controlled transformation state by balancing Life Conversion, Crimson Bloom, and Animagus power. 106 107
• Leads and supplies the group travelling through Spain while they evade assassins. 89
• Commands Durmstrang wizards in coordinated aerial shield formations. 414
• Personally inspects Durmstrang’s Living Spirit and oversees the school’s defenses. 404

Equipment

• Wand — Used for Transfiguration, Apparition, defensive magic, and combat spells. 77 86 119
• Green snake necklace — Releases numerous green snakes and reforms around her neck afterward. 79
• Hairpins — Used to secure her hair; she can transfigure documents into hairpins for concealment. 70
• Green crystal scepter — Used to deactivate Durmstrang’s hunting trap and release Hoffa from the castle’s defenses. 402
• Maps, cosmetics, and travelling supplies — Used to navigate, create disguises, and sustain the group during the journey through Morocco and Spain. 73 86 89

Relationships

• Hoffa Bach — Initially his stern protector under Dippet’s orders, then his travelling companion, Transfiguration professor, and uneasy ally in the search for the Forbidden Arts Library. They briefly duel over Dippet’s fate, reconcile after Sylby’s betrayal, and remain close years later. 80 120 124 402
• Sylby Spencer — A hostile travelling companion who exploited Osivia’s search for the library keys. She distrusted him from the beginning, yet continued protecting him until his true role in the conspiracy was revealed. 80 88 125
• Armando Dippet — Headmaster who assigned Osivia to protect Hoffa and later appointed her Hogwarts’s Transfiguration professor. Osivia attacked him when she believed he was the Half-Human King. 80 95 120
• Vladimir — Osivia’s fiancé and a Durmstrang wizard. Their engagement is political and tied to her family responsibilities; she frequently criticizes his lack of seriousness. 402 404
• Her younger brother — Deceased. Osivia compared Hoffa to him, describing both as stubborn and arrogant but not bad by nature. 113

Story Role / Major Arcs

Morocco and Spain

Osivia meets Hoffa while carrying out Dippet’s confidential Moroccan mission. Her insistence on protecting him conflicts with his need to earn money, prompting him to flee with Sylby. She pursues them through Casablanca with Transfiguration and serpent magic before joining their journey once Sylby reveals his connection to a library key. 71 77 80

As assassins pursue the group through Spain, Osivia becomes both guide and defender. In Barcelona, an encounter with a suited assassin destabilizes her; at Sants Station, she is found in a blood-soaked half-serpent form demanding Sylby’s key. 89 90 91

Hogwarts Professor and Library Search

Osivia becomes Hogwarts’s new Transfiguration professor and asks Hoffa to serve as her teaching assistant. He initially refuses because he distrusts her motives and believes she is driven by revenge. 95 100 101

The pair ultimately form an uneasy alliance to investigate the intruder connected to the Forbidden Arts Library. Osivia pushes Hoffa through the Mirror World’s trials, guides his development in Human Transfiguration, and helps uncover the White Stone Tomb clue. 104 106 108

Revenge, Reconciliation, and Sylby’s Betrayal

Osivia’s belief that Dippet is the Half-Human King leads her to attack him beneath the school hospital. Hoffa intervenes, and their duel ends with both badly injured. 120 121

Afterward, Osivia and Hoffa discover the hidden library beneath the Black Lake and confront Sylby. Sylby captures and tortures Osivia to force Hoffa into opening the Hogwarts Orb, but she survives and later rejects Sylby’s attempts to rule her through anger and vengeance. 124 126 130

Departure and Durmstrang

Having completed her original mission and found a purpose beyond revenge, Osivia leaves Hogwarts for the Soviet Union. She offers Hoffa a temporary Moscow residence permit and invites him to stay with her, though he declines. 134

Five years later, Hoffa reunites with Osivia as acting Headmistress of Durmstrang. She rescues him from the school’s hunting trap, introduces him to the Living Spirit beneath the castle, and later leads Durmstrang forces in battle against the Squib army. 402 404 414

Notable Quotes

“Transfiguration is magic of understanding, not magic of raw power.” 106

“There are more meaningful goals in my life than revenge.” 134