A helpful and considerate nature can be described as kind. It is kind of someone to volunteer to rake their elderly neighbor's leaves in the fall. As a noun, kind refers to the variety or specific type of something.
The adjective kind also describes showing sympathy or giving comfort. If someone's feelings are hurt, a kind word can go a long way to making that person feel better. When kind means "type," you might talk about a kind of cake — chocolate or vanilla — or a kind of person who likes to live alone. If you are kind of interested in something, you are only partially interested in it.