You can think of personality as describing how a person interacts with other people. Examples: Do they have a good personality? (In other words, do they get along well with others?) She has a funny personality. (In other words, she's a funny person.) What's their personality like? (How are they around others?) Character is about the actual quality or merits of a person overall. You can use it to describe someone's morality, integrity, or reputation. Examples: He has a good character. (He's a good person.) Their character is well-known. (Their reputation is well-known.) So if someone doesn't get along well with others but also works for charities, you could say that he has a bad personality but overall a good character.