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A people person is someone who is outgoing and has good communication skills. Peoples is used when we talk about two or more. People is a collective noun.
Nickelodeon's Ho Ho Holiday Special (2015) — The Movie Database (TMDB)
When we talk about a specific group of people, we consider it as singular and therefore, no need to add s. What is the plural of people person? He was always energetic and positive and he was a people person.
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