Although Senku has a strong sense of justice, he often bends the rules, and manipulates others to get what he wants.He often acts as if he builds inventions and uses people for his own interest, while actually creating for the betterment of others.Senku has a very logical mind, believing that there is nothing science cannot explain, even if it takes a long time to properly understand any one concept through science.Senku seems apathetic to the prospect of romance. He has red eyes.