Tina Heart—alternately spelled Herst or Hurst—is the daughter of researchers pioneering experimental mask technology. Her mother, Julia Herst, suffered lethal radiation exposure during a lab accident while pregnant, prompting her father, William Herst, to merge a prototype mask with his unborn child in a desperate bid to save her. This fusion granted Tina singular immunity to the masks’ fatal side effects, including rapid aging, allowing her to wield their power unharmed.

Integrated into her body, the mask continuously neutralizes lingering radiation from the accident, functioning as both lifeline and safeguard. Geffrey Connor, a fellow researcher, pursues her to harness this symbiosis, believing it holds the key to eradicating the masks’ lethal flaws.

As her story unfolds, Tina crosses paths with Anna Winehouse, a pharmaceutical CEO who shares fragments of her parents’ past. These revelations help Tina reconstruct her fractured family history, long obscured by her father’s silence regarding her mother’s contributions.

Her survival draws her into escalating tensions between the SSC and LIVE Corporation, prompting detective James Blood to intervene. He shields her from Connor’s ambitions, aware of her irreplaceable role in the masks’ evolution.

While her precise role remains undefined in the manga *Hero Mask: A lost memory*, the spin-off retains her origin as the accident’s sole survivor and her immunity to the masks’ toll, anchoring her narrative consistency across adaptations.