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People is a collective noun. What is the plural of people person? Peoples is used when we talk about two or more.
Dolly Parton PEOPLE Special Edition 'I Built My Own Strength'
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. He was always energetic and positive and he was a people person.