1. Generally speaking, if you are a cute and quiet girl, you will generally prefer titles such as "girl" and "girls". If you are the bold older sister type, you can call her daughter-in-law, aunt, etc.
2. If you are an artistic young person, you can call her little girl, dear little girl, etc. If you have a domineering sister-type girlfriend, you can call her dear, queen, etc. If you are more playful, you can call her pig head, little fool, little bad guy, little bean, etc.