Miyo Takano, originally Miyoko Tanashi, endured significant childhood trauma after her parents died in a train accident. She suffered abuse in an orphanage before adoption by her father's mentor, Hifumi Takano, whose ideas drove her quest for godhood through scientific recognition. Her research on Hinamizawa Syndrome and orchestration of village tragedies define her main series motivations.

Within the non-canon OVA series *Higurashi no Naku Koro ni Kira*, Takano appears in fantastical scenarios. During "Batsukoishi-hen" (Episode 1), she wears a bunny costume, acts seductively, and infects Keiichi Maebara with a fictional "True Hinamizawa Syndrome," leading to her death by his friends during their madness.

In "Ayakashisenshi-hen" (Episode 2), she serves as a general of the antagonistic Tokyo Magika, spreading a fog over Hinamizawa to induce hostility and validate her grandfather's "magic theory." She commands the ritual tool Nail Ripper until Rika and Satoko destroy it. Defeated, she is flung into the horizon while apologizing to an unspecified brother figure, mocked by other generals as the weakest member.

A brief appearance occurs in "Musubienishi-hen," where she comments on Keiichi and Mion Sonozaki's relationship. In the OVA *Rei*, she wears a tiger-print bikini during a beach episode.

Outside *Kira*, the light novel *Kaidan to Odorō, Soshite Anata wa Kaidan de Odoru* features an alternate version named Miyoko Tanashi, existing where her parents survived. This Miyoko is a quiet, melancholic high school student involved in a separate horror-mystery curse. *Kira*'s depictions focus on humor and fanservice, establishing no canonical backstory or progression for Takano.