Doris is Kowalski's love interest in The Penguins of Madagascar. Their relationship has a tumultuous history and her fickle nature has led to Kowalski's heart being broken many times. They eventually set their differences aside and get together in The Penguin Who Loved Me.
"What I meant to say is... I like you, Kowalski. Like you, like you." Doris to Kowalski after they defeat Dr. Blowhole and after dumping her ex-boyfriend, Parker the platypus.