"Bad Characters" is a term that appears to be related to a mobile game called "What in Hell is Bad?". This game is an adult otome game that takes place in a secret club located in hell where the Seven Deadly Sins reside as VIP members. The game features up to 72 devils, each with wildly different personalities and physical attributes for players to interact with in scenes and various mini-games. The characters in the game are applied to several mental illnesses as well as idiosyncrasies, and they are different in their personalities. The game is also a defense-type game where players command the characters and place them on tiles to defend against angels. The characters can be collected by pulling on the gacha system, and each character goes into the players collection, which can be viewed or used in battle.