Lilith Frost is dead.
She was one of the best they had, and she was dead.
Kiyohime Ikari was born, and she remembered her past life as Lilith when she bumped into a certain raven-haired future detective, making this life much much more interesting for her.
The Puppeteer, Lilith aka Kiyohime, only knows how to enjoy herself, and so she does. Slowly, twisting and turning and trapping everyone around her in her mind games, infuriating Light and L to no end.
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"So are you saying, Kiyo, that if you had Kira's power you would do the same thing?"
"Again, Sayu, I am not saying anything, but if I did have Kira's power, who's to say what I would have done? I wouldn't know myself, not until I would have gotten it before all this happened."
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Manipulation is an art, and she treats it as such. She takes it slow and steady, as if rewiring their minds in the way to favor herself. They are the puppeteers and she is the puppet, but what they don't realize is that their fingers move with the strings being manipulated by the puppet.
To L, she was an unknown piece in the giant game of chess he was playing with Kira. Or rather, she was the wildcard third person that had enough influence to disrupt his carefully laid out plays, and that demanded that he solve the enigma known as (Y/n) Yagami. She was dangerous, and knowing this, she wasn't above using her influence which made her a worrying variable.
If he was going to solve this case, he had a feeling that he would need (Y/n) to be playing for his side, which was easier said than done since it would further require uprooting her seemingly unwavering loyalty to her brother.