you can act in two ways or play a competitive game which is really not recommended for a game aimed at an adult audience or add more characters I would recommend parody characters from anime games or famous cartoons, but do not make sure that all the characters are available immediately otherwise all the people will play your game for a very short time because they will enter and choose the character and lose on purpose to see him naked and then delete him instead, to make him play for longer you could make sure that the characters have a cost that is the points you earn by playing so he will try to play for more time so as to unlock more characters and get passionate about your game, among other things, using famous characters will increase the audience of your game then there are the clothes of the characters but it is really too complicated for now