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Peoples is used when we talk about two or more. When we talk about a specific group of people, we consider it as singular and therefore, no need to add s. A people person is someone who is outgoing and has good communication skills.
PEOPLE Health Squad Dr. Travis Stork on How to Protect Yourself from
He was always energetic and positive and he was a people person. What is the plural of people person? People is a collective noun.