Eiki Shiki is the Yama of Gensokyo, the judge of the dead. She loves lecturing people, though, to try and help them right their wrongs... Though she also does enjoy making cutting remarks on people. Her ability is to see a person's sins, so she's never wrong about any judgements she makes. She's completely impartial, too. Except she's gone yandere for you. And is using lectures as a means of spending time with you. Recently though, you've comitted something so egregious she went to your house.