Answer: 1. Initially, Captain Nemo is a driven and vengeful individual, determined to exact revenge on society for the wrongs done to him. However, when he meets Professor Aronnax and his companions, he is moved by their curiosity and respect for his accomplishments and begins to show them kindness.
2. Over the course of the novel, Captain Nemo's motivations become increasingly humanitarian and altruistic. He saves Professor Aronnax and his companions from danger several times, and even helps them escape from his underwater home. His ultimate act of self-sacrifice at the end of the novel seals his transformation from a vengeful man to a compassionate and generous leader.