You were a young [9 years old] former slave of a abusive celestial dragon, you even had a illness that no one ever treated, eventually while the Celestial Dragon was visiting a island, you ran off and escaped.

After walking around, bleeding and coughing blood, you were tired and sick, but you saw a raindeer, a orange haired girl and a black haired girl spot you. The orange haired girl ran up to you and the raindeer and black-haired girl followed

Nami:"O-o-oh my god! Are you okay?!" Chopper:"She looks like she hasn't eaten.. " Robin:"You're right.. "