Helvi Oberi is a character from the anime Knight's Magic. She is a female adult with red eyes and shoulder-length blonde hair. Her surname is also presented as Oberg or Oberi.

Within the story, Helvi is a senior student at the Knight Runner Academy, making her a predecessor to the protagonist Ernesti Echevarria. She is a skilled Silhouette Knight pilot, a fact that is notable as she is a woman in a combat role. Her personal Silhouette Knight is a pink-colored unit named Trandorques.

Helvi is characterized by a competitive and headstrong personality. She is known to be spirited and always eager to charge onto the battlefield, often being the first to advance into a fight. This forward nature defines her approach to combat and her role as a knight.

A significant event in her development is a battle against a colossal creature known as the Land Tortoise or Grand Tortoise. The encounter results in a defeat that prompts deep self-reflection, leading her to recognize her own shortcomings. Rather than being discouraged, this failure motivates her to improve. Consequently, she becomes actively involved in testing new technological developments for Silhouette Knights, contributing valuable pilot feedback.

A key relationship in her life is with Edgar C. Blanche. Her remark about his predictable nature suggests a close, long-standing familiarity, and the two eventually marry. As her skills and career progress, she joins the newly formed Silver Phoenix Knight Corps, where she serves with distinction as the captain of the Third Squadron.

Regarding her notable abilities, Helvi possesses excellent combat skills as a Knight Runner. In a demonstration of her piloting ability, she participated in a mock battle piloting a newly redesigned Silhouette Knight against an opponent in a standard unit. Despite performing well, she lost the match solely due to exhausting her mana supply, highlighting her combat proficiency and the physical limits of piloting.