Hanna Hills is the youngest sibling of the Hills Family. She is around Manny's age, She was shown on Diary of a Wimpy Kid Online, and was shown with Her Dad, Piper Matthews (Holly Hills,) Jennifer Matthews, and Lori Matthews (Heather Hills,) (and she is the counterpart of the Unnamed Matthews Daughter (who is in The Matthews Family.) And also, she was mentioned in Diary of a Wimpy Kid: Rodrick Rules (film). Nothing else is known about her.
- She is the only sister of the Hills Family who was mentioned in the movies, but never appeared in the books.
- It is unknown if she is a real character in the books, because Holly mentioned her to Greg in Rodrick Rules (Film), but she might be a non-canon character.