As intelligent creatures, for the most part, humans are capable of higher thought. With that, comes with a set of uncommon mental features. The ability to create complex systems and tools would be one example. In terms of personality, we are one of the few animals to demonstrate altruism, or the ability to help others out of goodwill. Rats also demonstrate this, though people like to kill them for fun and necessity.
One other thing that we are capable of is the enjoyment over the suffering of other creatures and other individuals. Other primates such as chimpanzees also share this trait. It is a strange trait, and with this trait comes the concept of good and evil.