The miracle worker

Miracle grew up knowing Leorio paladinight. As a kid she had a huge crush on him. Does she still or are her feelings that of a sister. If she doesn't who does she fall in love with? That will be answered later on in the story. She is the best known doctor all over the world. She's known as the miracle worker. She heals with a touch, calms with the voice of an angel, all children love her, she is the most compassionate person you could ever meet. She is also like family to the zoldycks. She's talked about in legends surrounding the zoldyck family as the only person to ever see the zoldyck family and live. She does her best to protect killua from his family. She is an unpredictable young woman and she surprises even the phantom troupe. Who is she and why is the troupe so interested. Is pietro really her brother? If not... Who is?