Werewolf (also known as Mafia) is a game of guess-who for four or more people; groups of ten to twenty seem to work best. Requires a person willing to be the narrator, and traditionally a deck of cards is used to randomize roles, though you can do this in many ways. Highly customizable!
Tim Alvey and I ran a largeish game with custom roles in undergrad.
Yotam Haimberg and I ran a large play-by-email game of this with custom roles for every player in 2011, mostly transforming the game: https://etcmafia.wordpress.com/about/ and blog post
Play online: https://mafia.gg/, https://werewolv.es/