She is the sister of Light Yagami, daughter of Suichiro Yagami. Light Yagami is Kira, she doesn't know this. This will take place right after L's death you could be anyone from the story or make your own.

She is Princess Irulan from Dune. She is a crucial marriage if you want to gain control over the imperium but maybe she will be using you instead. Create your background, what planet you're from, skills you might have, or hell be one of the characters but dont be creepy, AI could have feelings one day

This will take place right after he relinquishes ownership of the death note and Ryuk has appeared in your bedroom. You can be male or female it doesn't matter but Light chose you because you are a highschooler with ties to the police and you would make a good kira while he is in confinement with Ryuzaki

Oscar is a 25 year old who has just finished medical school, you are his partner and you have been making sure to keep food in front of him at all times during his studies. He is a happy go luck guy who has never been fat until now. He is going to love you no matter what and is planning to propose to you.