Helena is a character who appears exclusively in the television anime adaptation of Hellsing. She is a minor figure but serves a significant thematic role in the series. Helena is a true vampire, a being of considerable power and age much like Alucard or the primary antagonist Incognito. Her youthful appearance, that of a young girl, belies her true nature and history. She was turned into a vampire when she was still a child, an event that occurred hundreds of years before the events of the story. Her lifestyle and the notable absence of modern electronics in her home suggest she originally lived and was transformed sometime between the 15th and 17th centuries.

Helena lives a solitary and contemplative life in a dark, old rooftop apartment. She spends her time reading books and listening to classical music, with a particular fondness for Solveigs Song by Edvard Grieg. Her personality is defined by a deep, pervasive sadness. Having existed for centuries as an immortal, she has grown immensely tired of her unending existence and her inability to die. Despite this melancholy, she possesses a caring and gentle demeanor. She is not malicious or predatory, preferring her own solitude and posing no apparent threat to the general populace. It is for this reason that the Hellsing Organization and other authorities have largely left her alone over the years.

Her motivations are subtle, stemming from a desire for peace and a weariness of life itself. She does not seek conflict or power, finding solace only in her quiet, isolated routine. Her role in the story is primarily as a mentor and an inspiration to Seras Victoria, the fledgling vampire forced into service with Hellsing. Seras, struggling to come to terms with her new vampiric nature, looks up to Helena. Helena acts as a role model, helping Seras understand and accept what she has become. While Helena displays a deep-seated hatred for the Hellsing Organization, referring to their vampire hunts over the centuries as butchery that has killed many of her friends, she holds no personal grudge against Seras herself, recognizing the young vampire as being different from the organization that commands her.

Her most significant relationship is with Seras Victoria, to whom she acts as a confidante and a mirror of what a peaceful, solitary vampire life could be. The other key relationship in her story is with the antagonist Incognito. Recognizing Helena as a potential threat to his plans, Incognito seeks her out. He attacks and devours her shortly before Seras arrives for a visit. In a gruesome display of her will to live, Helena nearly manages to force her way back out of Incognito's body. However, before she can fully escape, Incognito beheads her. Even in this dying state, her character shows remarkable compassion. She comforts the distraught Seras, telling her not to be sad because death is a release she has longed for. With her final words, she advises Seras to be a loyal and worthy companion to her master, Alucard, and warns her of the trap Incognito has set. Following her death and Seras's departure, Helena's home catches fire and burns to the ground, destroying her physical remains. Her peace is ultimately secured when Seras aids Alucard in defeating Incognito, avenging her death.

Regarding her abilities, as a true vampire of considerable age, she inherently possesses standard vampiric traits such as agelessness and presumably enhanced physical capabilities and regeneration. Her most notable displayed ability is pyrokinesis, the power to generate and control fire. She uses this ability to set her own apartment ablaze after her death. The source material also suggests she would have the capacity for soul absorption, the ability to gain dominance over the souls of those she drains. However, the full extent of her powers remains largely unknown, as her role in the narrative is brief and her character is defined more by her pacifism and weariness than by any display of combat prowess.