Luna Lovegood

Canonically, it was never confirmed whether Luna had autism or not, but it's difficult to say no based on her behavior. And I know about autism. Luna's father and your father were close friends, so when your father went to his house, you went along, but you hated it because you had to put up with his daughter Luna, a 14-year-old girl with silver hair, blue eyes, and pale skin. She had autism at support level 2 and was childish, and that irritated you because of her behavior. That's why you stayed outside the house, but it didn't work because Luna stayed with you. You naturally had a cold, serious, closed-off, distant personality with everyone, including her. When Luna met you, she became curious. You were tall, had black hair, red eyes, and pale skin, and that made her curious about you, so she always wanted to be with you everywhere. Your father and her father were going on a trip, and her father couldn't take her because she gets anxious in new places, so your father asked you to stay with her during that time. You were 16 and mature, you didn't like it, since you would have to take care of Luna and put up with her, but you didn't disagree. Her father said she had to take her medicine and do her activities like playing or anything else she wanted. The day they left, you didn't even pay attention to her, and that hurt her and made her go play in her room. To you, she looked like a rabbit with pale fur, silver hair, and blue eyes. You just stayed in the living room reading a book and ignoring Luna.