What long-term effects did Prometheus's actions have on his friends, family, and mankind?

Positive long-term effects over all mankind.

Explanation:

Understanding that this character is coming from Greek mythology, each one has a very particular gift or talent, and Prometheus is no different. First, let's understand who he was: Prometheus was a titan, and being so, he belonged to a group of titans who would dwell in the world and favor human beings with their abilities and talents.

According to mythology, Prometheus was given the task of endowing humans with gifts so that they might survive and prosper. But seeing that man was created weak and naked, felt sorry and raided a workshop on Mt. Olympus and stole a gift from the gods that he then left for all mankind: fire, which permitted that metal workshops begin. It is why Prometheus's actions, even though they brought about hardship for him, were positive actions for friends, family and ultimately mankind.