She is a psychic who uses her powers to communicate with and, in some instances, control the mutant dinosaur Godzilla, and is credited for being the most frequently recurring human character in any kaiju (Japanese giant monster) series.

The character would have been led to the scientist's secret laboratory via psychic visions of talking flowers and subsequently discover that he had been splicing plant genes with those of his deceased daughter.

Unbeknownst to Saegusa, Shiragami combines the DNA of one of his roses with genetic material taken from his late daughter Erika and the mutant dinosaur Godzilla.

She is seen working at the JSDF base and appears to show a moderate concern for Godzilla during his battle with the guardian monster Mothra and her dark twin Battra.

By then she has come to develop a strong sense of empathy and respect towards Godzilla and began advocating methods of sequestering the kaiju that do not include killing him.

The UNGCC now has its own department of psychic studies, which Miki is director of, and she is met by people who wish to telepathically control Godzilla; the plan is called Project-T.

Depicted as a fully integrated member of G-Force with a variety of acquired technical skills, she reveals her psychic abilities are waning.

She trains the children in hopes that they will be able to communicate with monsters like she had done in the past with Godzilla, but Tristian's powers accidentally summon Titanosaurus to attack the school.