Good Guys and Bad Guys

This past week we learned that Toldot is the overall theme of sefer Bereishit. We saw that those who were the "bad" kids in each generation were categorized under "geneology" and those who were "good" were categorized under "stories." We skimmed through the material and saw how the story progressed from Adam to Yaakov and his sons, who became us, the Jewish nation. But, we know that there were always bad guys in each generation after Yaakov and his good sons. It became normal for each generation to have some bad guys and some good guys, and we can still see this today. In each generation there are people who go "off the derech" and stray from the ways of the Torah or the ways of their parents. So, what I want to know is, could these people be considered the "bad" guys? Many times they just go through phases where they want to rebel, but as they mature, they come back to where they started, so they do not seem "bad."

Also, do you think there were people like this in the story of Bereishit who were bad and then became good? Which category would they be listed in if this were the case?