My-HiME Anime
Miyu initially appears as a girl in Mai Tokiha's class and the adopted daughter of Joseph Greer, the resident priest of Fuuka Academy. She is friendly towards Mai, making strange comments about the exact temperature and amount of precipitation, and is very protective of Alyssa Searrs.
After encountering Akane Higurashi, whom she saw fighting an Orphan, Miyu is revealed to be an android created by Joseph Greer of the SEARRS organization to protect Alyssa, as being a "fake" HiME Alyssa is unable to materialize an element and hence relies on Miyu for protection. Her name is an acronym for Multiple Intelligencial Yggdrasil Unit. She lures Akane out with an Orphan and forces her to summon her Child, Hari, and upon defeating the Orphan Miyu kills Hari with her anti-materializing weapon, and by extension Akane's boyfriend Kazuya, demonstrating the dire consequences of losing in the HiME Carnival. She is later seen observing the HiME via a surveillance room in the basement of the Church and looking after Alyssa until Natsuki Kuga arrives and confronts them only to be knocked out, though Miyu advises Greer not to kill her because it "is unwise to kill a Valkyrie without her Child present".
When the true intentions of the SEARRS organization - to replace the real HiMEs with Alyssa and hence gain control of the power of the Obsidian Lord - become clear Miyu takes an active role against the HiME, though with the combined efforts of the HiME and Alyssa's Child's defeat she flees with Alyssa in the hope of finding safety. However, Joseph Greer, who had earlier been dismissed for incompetence after finding that the codes he had installed in Miyu had all been erased, appears and shoots Alyssa before himself being dispatched by Miyu in retaliation. As Alyssa dies Miyu is visibly distraught and cries that the "Golden Light" she loved has faded. She carries Alyssa's body into a frozen lake, where it is assumed Miyu herself perished.
However, in episode 23 it is revealed that Mashiro salvaged Miyu and reformatted her and several pieces of SEARRS technology, introducing a new element into the HiME Carnival that the Obsidian Lord could not anticipate. She is revived by Midori Sugiura before fighting Mikoto and assisting the HiME indirectly. A small presence in the form of a flame that spoke with Alyssa's voice activated Miyu's "Platinum Mode" and anti-Materialiser weapon during the final battle that assisted Mashiro in her escape from the crystal she was trapped in, and the resurrection of the defeated HiME.
In the end Alyssa is revived by Mashiro with the other HiME, and Miyu is seen becoming a nun along with Nao Yuuki in the Fuuka church with Alyssa by her side.
Read more about this topic: Miyu Greer