person, character, figure인물 means “person,” “character,” or “figure,” often referring to someone notable or a character in a story. 이 is the subject particle, so 인물이 means “the person/character is” or “the person/character...” depending on the sentence.
KO: 그 영화의 인물이 정말 인상적이에요.
EN: The character in that movie is really impressive.