Kaguya

かぐや

Kaguya serves as the primary antagonist in the second Inuyasha film, "Castle Beyond the Looking Glass."
Kaguya is described as a fallen angel, though it remains unclear whether she is genuinely an angel or simply a demon who believes herself to be one. She covets the Celestial Robe, which grants immortality. Long ago, Kaguya was sealed within a mirror that appears similar to Kanna's. Acting on orders from the recently deceased Naraku, Kagura and Kanna embark on a quest to gather five magical items, one of which is a fragment of InuYasha's robe. Kagome is captured during the retrieval of the fifth item.
Once the items are collected, five beams of light form a pentagram over Japan, releasing Kaguya. InuYasha rushes to Kaguya's castle, with Shippo, Sango, Kohaku, and Miroku trailing behind. Kaguya employs the mirror that previously held her seal to imprison InuYasha's human side, thereby unleashing his full demon nature. In a desperate bid to halt the transformation, Kagome kisses him, which cracks Kaguya's mirror and breaks the spell. Sango and the others arrive at this moment to witness the couple's first kiss. Kanna then uses her own mirror to steal some of Kaguya's life force. Subsequently, a spider mark appears on Kohaku's back, and Naraku emerges, proving he is not as dead as InuYasha and his companions had hoped. Kohaku once again falls under Naraku's control, and Miroku regains his Wind Tunnel.
The castle begins to collapse, prompting InuYasha and the group to flee. Kaguya pursues them as a black cloud, intent on killing them. However, Miroku uses his Wind Tunnel to absorb Kaguya. Everyone, including Naraku, escapes the castle unharmed.
Kaguya is purported to be Kaguya-hime, the girl from the well-known Japanese tale, the Legend of the Bamboo Cutter. Again, it is not definitively stated whether Kaguya is actually Kaguya-hime or merely believes herself to be. In the legend, five princes seek Kaguya-hime's hand in marriage. Intending not to marry any of them, Kaguya-hime sends each on a quest to retrieve five treasures: the basin of Buddha, a silver and gold alzalea, the Chinese Fire mouse (or fire rat, as seen in InuYasha's robe), a colored dragon jewel, and the seashore treasure of the swallows.
All the princes fail their tasks and thus fail to win Kaguya-hime's favor. In the movie, these treasures serve as the key to releasing Kaguya from her mirror. They also represent wood, earth, fire, metal, and water. In the film, Kaguya desires the Celestial Robe to gain the power of a celestial being so she can return to the moon. In the original legend, Kaguya-hime returns to the moon after a set period, claiming her time on earth was merely punishment for an unknown crime.