Logic vs. emotion

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Logic vs. emotion
Nathan and Peter represent the extremes of logic and emotion.

Recurrences

Peter and Nathan

Peter follows his heart and does what's best for those around him, while his older brother Nathan follows what his mind tells him makes sense.

Niki and her alto-ego 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., she refuses to do so out of love.

Ando and Hiro

Ando is a more realistic person than Hiro. At first, he refuses to believe in Hiro's powers because he does not believe such feats 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 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 wants 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.

Isaac and Peter

When Isaac and Peter come to blows, Isaac allows his emotions to overcome him to such a degree that he unwisely fires his gun wildly, hoping to hit an invisible Peter, and instead shoots and kills Simone. (Unexpected)