Logic vs. emotion

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One recurring theme in the series is the age-old conflict between logic and emotion. This has manifested itself in several personal conflicts between the various characters.

• Peter and Nathan - the younger brother who follows his heart tells him and the older brother who follows what his mind tells him makes sense.
• Niki and Jessica - Jessica represents a more cold, logical voice to counter the more emotional Niki. While both women are willing to give of themselves to some degree (i.e. Niki's becoming a stripper to make ends meet so she can care for her son), Jessica has a much more brutal and realistic take on some situations. For instance, while it probably would be in Niki's best interest to end her relationship with D.L. (who, for all his fine qualities, is still a criminal), she refuses to do so out of love.
• Ando and Hiro - Ando is a more realistic person than the dreamer Hiro. At first he refuses to believe in Hiro's powers because he does not believe such things are possible. Even when confronted with the reality of Hiro's powers, he still seeks to use Hiro's powers in a way that he thinks is sensible (i.e. making money) instead of thinking of the loftier goals of saving the world.
• Chandra and Mohinder - Chandra refuses the help of his son, quoting Darwin and saying that a scientist must be free of emotion. Mohinder, at that point, is wanting to help his father purely out of a loving son's devotion to his father and a disciple's love of his mentor.
• Peter and Sylar - both have shown some capacity for using the powers of others. But while Peter's is based on a desire to nurture and his ability to connect with people emotionally, Sylar's power is based on understanding how things work logically and a desire to control.