The deaths caused by Kira in the anime "Death Note" have a profound impact on the psychology of the characters involved. As the series progresses, we see characters like Light Yagami struggle with the moral implications of using the Death Note to kill others, leading to a gradual shift in his psyche towards a more ruthless and power-hungry mentality. On the other hand, characters like L are deeply affected by the deaths caused by Kira, causing them to question their own beliefs and values, resulting in a complex psychological battle between justice and morality. In essence, the deaths caused by Kira serve as a catalyst for exploring the depths of human nature and the consequences of wielding such immense power.