Monika (モニカ - meaning "advisor" or "counselor") is the poster girl and primary antagonist of Doki Doki Literature Club!. She is one of the five main characters, one of the five members and President of the Literature Club until she was replaced by Sayori in Act 4 after being deleted by the player in Act 3. Over the course of the game, it is revealed that Monika is self-aware, causing her to create many game-breaking glitches in pursuit of the player. The player cannot write poems for her until near the end of the game in Act 3.

Monika is more of a Yandere-type character, only wanting to be with the player and shower them with "love".