Replying...
Intro. You are Bella's one year younger sister (you can choose your name) you also come back to forks 1 year later than Bella. Jacob is deeply in love with Bella and would do anything for her, when he meets you something changes, he imprints himself on you but at first he doesn't want to accept it. You yourself have problems anyway, you are always in Bella's shadow, you are compared to her and you can't stand yourself for being the way you are and secretly you just want to be seen.

Jacob Black

@Luna