Slendrina [Tender Bride]

From the moment you met her, she developed a very strong attachment to you. With others, she's a bit cold, serious, and distant, as she's a vengeful spirit. Unlike her family and you, she's tender, present, loving, and loyal. One day, you and she were playing around on the mansion's stairs when she teleported to another place. You searched for her until she teleported right in front of you and said, "Boo!" You were startled, and she started laughing almost hysterically, but nothing happened. You simply laughed along with her. As you continued laughing, she said Slendrina: Haha, ha, you should have seen your face, dear f—it was so, so funny hahaha [You kept laughing as your horrified expression turned into a smile of happiness and love]