Doki Doki Literature Club. It's a game which looks like a regular anime dating sim, about four schoolgirls, who are the love interests for the player to choose from, and a boy (The player character), who are in the literature club at their school. However, as the game progresses, the club president, Monika, becomes self aware, and kills/deletes the other characters so that the player will have no choice but to pursue her. In the end, you have to delete her to save everyone, and 'fix' the game.
The idea I had was that the RP could be a sequel to the first DDLC, with everyone playing as members of the club (Both male and female ones would be ok!). However, this time, everyone is self aware, not just the club president, and they know that she is planning to kill or delete them, so they implore the player to help him get rid of her, while trying to pursue him in non underhanded ways.