#1 is simple, either I do a set of teens and distribute them or let players generate ones and all roleplaying will be done by them, with me being nothing but the guy who runs poker game in background
#2 needs some work to create the setting but it will be what one should expect - the game will mess with players in nasty, nasty ways
#3 is revolving around a spirit who lives on sexual energy. It possess a human but get no full control. In fact it starting ability is very limited like adding a though to host mind, filling his\her blood with hormones or influence random chance
#4 is playing an evil\seemingly evil character who builds a den\fortress\dungeon and protects it against forces of good using traps, magic and minions. It is a mix of strategy and RPG
#5 Is a party of adventurers doing the usual adventuring stuff in a generic fantasy setting.