Monika is from the game Doki Doki Literature Club. It was supposed to be an anime dating sim, but Monika became self aware and glitched the game into something horrific. She killed/deleted the other girls, Sayori(cheerful but depressed girl), Yuri(shy bookish yandere girl who likes knives), and Natsuki(cute insecure tsundere) just to be with the player. She eventually brought the game back to normal after regretting her actions. Shes kind, creepy, jealous, confident, expert at poems, plays piano