One series finale that ended perfectly for me is 'The Good Place.' The show managed to wrap up each character's journey in a meaningful and satisfying way, exploring deep themes while maintaining its humor and heart.
Mine is Six Feet Under. The finale provides a flash-forward sequence showing the future deaths of all the main characters, giving closure to their stories and the series. The show's central theme about life and death, offering a sense of closure while celebrating the characters' lives.