The Shinigami (Death Note)
The Shinigami in Death Note exists to kill humans. It’s required for them to survive. Ryuk deliberately drops his Death Note into the human world out of boredom. He takes joy in Light Yagami’s mass-murdering but largely doesn’t care about their death because it’s all part of nature. Since all humans are going to die anyway, why be concerned with premature deaths.
The Zoldyk family (Hunter X Hunter)
The Zoldyk family is a family of assassins. The family is highly pragmatic that practice tough love. They have a strict approach to their profession and a love of violence. However, they have a strict rule against killing the innocent. Their cold demeanor extends to each other. It works when assassinating people, not so much when relating to the family.
The Pillar Men (JoJo Bizarre Adventure)
The Pillar Men are an ancient humanoid race. They’re almost extinct, but use to live thousand of years ago. Highly intelligent, powerful, and capable of manipulating the bodies to a high degree. Due to being such an elite and old race, they have very little regard for humanity. They view humanity the way humans tend to view insects. They even killed a character without noticing. However, the Pillar Men seem to value non-human life, going out of their ways to avoid destroying things like flowers.
The Angels (Evangelion)
Angels in Evangelion refer to the fifteen children of Adam. Exactly what Angels are can be confusing. Supposedly, Angel’s are a variation of the human race. At first, they appear as humanoid entities, then they “reject” the human form. Angel’s have unique forms. The motives of the Angel’s are left ambiguous. One theory is that they’re trying to “return to Adam,” that’s located deep underground. They may want to “access Lilith and reset all life.” Angel’s don’t seem to communicate and often have no expression. Overall, the Angel’s seem to function on some sort of autopilot. What motivates hem is unknown but it appears that they only fight out of instinct.
The Saiyans (DBZ)
According to Akira Toriyama Saiyans are considered amoral. They are a warrior race that loves battle and strength above all else. Goku often displays the amorality and its possible consequence. He often spares the life of a villain so they could get stronger a fight again. During the Cell Games, he gives Cell a Senzu bean so he could have a “fair fight” against Gohan. He does this although it would have benefited Earth and increase Gohan’s chances. Also, the Saiyans have an odd view of romantic relationships. Saiyan form sexual relationships for procreation and not for love. Most Saiyans don’t have romantic or parental love for spouses or children. It’s the primary reason Goku and Vegeta don’t have the best relationship with their wives and children.