Yosef

Yosef is an interesting character. He was always Yaakov's favorite because he was Rachel's oldest son, and his brothers became very jealous of him. He then grew up in Egypt and learned how to govern a people and live as an Egyptian. His experiences led him to be able to bring a lot of different things to the table of Bnei Yisrael. In a way, what happened to him is the one thing that was able to unite the brothers. I don't think that Yosef's exile was a punishment, in fact it was probably a good experience for the most part. I think that Hashem put him through it to make him that much stronger and able to be the glue that holds the brothers together. He became their connection to each other and it is because of him that Bnei Yisrael exists today.