personality

性格(せいかく)	Personality. $$$PPP

性質(せいしつ)	Natural quality. In contrast to 性格, 性質 applies to rocks and things, as well as people and animals. Also it refers to the inner nature of people, rather than their social selves. So if you wanted to say that someone was very outgoing and loved sports and bars, you wouldn’t use 性質. But if you wanted to say that someone was very stoic or honest, you would. TTT

品性(ひんせい)	Moral character, as in “Eat your broccoli, it builds character.” Example:彼は品性がある =He has good moral character. PPP