Movie
Description
Iris originates from the planet Eltria, initially existing as an intangible artificial intelligence within a relic stone tablet housed in an abandoned church. She manifests as a non-corporeal entity to Kyrie Florian, becoming the girl's childhood friend. Due to her spiritual nature, Iris does not physically age as Kyrie matures. Her fundamental personality is cheerful and obliging, with an inability to leave people in trouble unhelped.

Iris advises Kyrie that the Examia crystal on Earth is key to saving their dying homeworld, Eltria. Accompanying Kyrie to Earth within the small blue stone tablet, Iris later assaults Hayate Yagami to acquire the Tome of the Night Sky, a plan thwarted by Amitie Florian. After Kyrie obtains the Tome and gives it to her, Iris uses Eltrian high-tech Formula systems to emulate Ancient Belkan magic, summoning and materializing the souls Dearche, Stern, and Levi into physical forms.

Upon locating the Examia crystal, Iris accesses it, activating embedded virus codes. She then reveals to Kyrie that the plan to save Eltria was a deception. Attacking Kyrie's existing wound, Iris discloses her own past as a human on Eltria and her deeper motives stemming from a decades-old tragedy. She forcibly activates "Crystal Tree," an ability tied to the dormant Yuri within the Examia. Iris absorbs life energy from Chrono Harlaown and his team to materialize a physical body, transforming into her invasive armed form "Asteria," marked by metallic armor components and elongated hair.

Her true objective is reuniting with Yuri to exact revenge for events roughly forty years prior. Iris recounts that Yuri killed her and her family during a confrontation at an Eltrian research facility. After materializing, Iris seizes the unconscious Yuri, intending to dominate her via virus codes and use her as a weapon against Time-Space Administration Bureau mages. She confronts Kyrie again, dismissing the girl's emotional appeals.

During the ensuing conflict, Iris creates numerous android duplicates: Mass Production Types for research and combat support, Inherent Types with distinct appearances and leadership roles, and specialized Satellite Cannon Types for zero-gravity combat. Unbeknownst to Iris, this self-replication facilitates the resurrection of Phil Maxwell, the true architect of her suffering. Maxwell had implanted a copy of his consciousness within her systems before his death forty years earlier. Resurrected in an android body, Maxwell reveals he orchestrated the events leading to her death and Yuri's exile. He manipulated Iris into believing Yuri massacred their research team—including Maxwell himself—when in reality, Maxwell ordered the slaughter via early Iris Units after the planet's revitalization funding was cut, aiming to profit from selling her terraforming and replication technology as weapons.

Under Maxwell's direct control via the virus codes she used on Yuri, Iris attacks Kyrie, verbally rejecting their friendship. Kyrie resists, asserting Iris genuinely cared for her. After Nanoha Takamachi and Fate Testarossa defeat Maxwell, Iris is freed. The Time-Space Administration Bureau confines her due to her actions on Earth but later acquits her upon concluding Maxwell manipulated her throughout. Iris returns to Eltria, reuniting with Kyrie, Amitie Florian, Yuri, and the materialized souls (Dearche, Stern, Levi). Collaborating with them, Iris successfully combines her Formula technology with Yuri's magic to revitalize their home planet.

In an alternate continuity featured in the bonus chapter of INNOCENTS (Duel:eX), she appears as Iris Sevenfield, visiting Uminari City as the daughter of an environmental scientist and an assistant in his work. This iteration also depicts her as an old friend of Yuri, Dearche, Stern, and Levi.