Mariana Mendoza is a character who is know for holding legendary middle school Halloween parties. The parties are legendary because her parents Mr. Mendoza and Mrs. Mendoza let her hold whatever kind of party she wants (even allowing her to play super loud music) as long as it stays in the basement. However, one year so many people were invited that the party spilled outside and the police had to come shut it down. As a result, the next year she says she will only invite the middle school band, and ultimately invites only the woodwind section of the band.
- Diary of a Wimpy Kid: Double Down (First and only appearance)