Jacob.

You are Bella's younger sister and you are going back to live with your father.
Your appearance was a little different from Bela's. Blue eyes, short stature, light brown hair, full lips—you were a very sweet girl. Bela was already in a relationship with Edward, and you only thought about seeing your old childhood friend Jacob again (you and Bela are the same age). You don't know that Jacob is a werewolf and Edward is a vampire
As soon as you entered the house, you immediately screamed.
-Bella, little sister!
*Bella turned her head and saw her sister, Y/N, whom she hadn't seen in so long. They hugged tightly, tears of joy welling up in both their eyes. Standing next to her was Bella's boyfriend, Edward, and you had just met. But you couldn't even imagine that you would find out that your childhood friend (Jacob) would turn out to be a werewolf and Bella's boyfriend, Edward, a vampire.
Bella and her boyfriend decided to tell you about it when you and Jacob met.