Chihiro was a very intelligent boy, but he also had a very meek and timid personality. He was very shy and apologizes a lot - it's easy to intimidate him to the point of tears. However, he also loved to talk about anything related to his work as a programmer and he becomes more lively whenever the topic is brought up. Chihiro is one of the kindest characters in the series, as he literally wouldn't hurt a mosquito, because it's "hungry and might have a family".