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My English is not very good, so there may be some translation mistakes.:¯ᯅ¯:

Shiro is the 11th mask hidden away. Unlike the other generals, Shiro was not one of the oni during Taratudo's rule in Japan. She is approximately over 600 years old. In her self-narrated origins, 200 years after the end of Taratudo 's rule in Japan, as a princess of the emperor, she accidentally stumbled upon stories about oni and became intrigued, delving deep into them over time. As time passed, her research into oni became increasingly profound, gradually leading her to obsession. She then used her self-created black magic to transform into an oni, wreaking havoc in Japan for 60 years single-handedly before being subdued by a benevolent wizard into the mask.

Now, by a stroke of luck, she has been discovered and worn by vanish. Vanish wears the mask, her thoughts are controlled by Shiro. As a shrine maiden, Shiro, relying on her acquired witchcraft, releases the shadow generals. However, being a natural witch, Shiro's ability to wield dark powers is somewhat insufficient. She can only manage to create the physical bodies of the generals with great difficulty. Consequently, the generals must rely on themselves to regain their powers. Compared to the Vanish's body, Shiro prefers her own. Therefore, after releasing the shadow generals, she takes back her own body.

Just before being subdued, Shiro was determined never to go solo again if given another chance. So, after possessing Vanish, she immediately rushes to undo Taratudo's seal based on Vanish's memory, marking Shiro and Taratudo's first formal encounter.

"Because I am powerful, it is only natural for many men to pursue me; because I am powerful, only equally powerful people are worthy of me." Shiro holds such a belief. Therefore, in her first encounter with Taratudo, Shiro mistakenly believes that Taratudo would definitely become one of her many suitors.

It's worth noting that the stone slab in the Temple of the ShenDu that records the history of oni is actually a ceiling mural in the shrine built by Shiro for the oni. Shiro visits her family home and exclaims: "Haven't seen each other for centuries, and my family hall has turned into an open-air one!"

Also, because Shiro has delved deep into the history of oni, she knows their habits well. However, the oni know nothing about Shiro.

Moreover, Shiro enjoys boldly questioning the oni about the authenticity of some scandalous tales, but most of the questions are too inappropriate. Each time they are questioned, the oni eagerly try to prove their innocence, which Shiro enjoys seeing.

Shiro's third eye is not just for decoration; it can indeed see things. And it doesn't close when she sleeps. So if someone wants to play a prank while she's asleep, getting caught is just a matter of minutes.

Shiro also assimilates despairing humans into her Shadowkhan.

... Popular characters who is enough to be recognised by the text description in AI vs characters who showed up only once from whole 95 episodes and AI have no idea who are these people.