An adventure game where the player assumes the role of a serial killer. A point and click game but with an open "world". A city with a few locations the player can go, passing time, (you would be able to fast-forward), characters that would "live their own lives"(go to work, visit their friends, sleep, etc.). The environment would be highly interactive, more than one way to solve problems...
There would be several different killers you could play: A mafia hitman, a "bible thumper" type of murderer, some kind of cannibal, just a fucking nutjob...each would have a "campaign" to complete. Several missions consisting of killing people, sometimes just a random victim, sometimes a specific person or a type of person (and sometimes killing in a specific way and/or place).
The game would allow a lot of freedom, the player would be free to choose whatever method of killing he wants. Guns, blunt objects, blades, poison...of course you have to do it in a remote place, make sure no one is looking/listening (an if kill the witness), making sure that your activity can't be traced would be an important part of gameplay. With each kill the police would be more aware of you and you would have to be more careful. Sometimes the objective would be to get caught, leave clues for the cops so they could catch you after a few murders.
Each character would get his tasks in a different way: the hitman would just take orders from some mafia boss, but some other more crazy characters would have visions, hallucinations etc, for example the bible freak would see Jesus in TV or hear him on the radio giving him orders to kill...
Some ideas about characters:
-Contract killer. It would be some older guy, who wants to retire from his job, he would get his missions from some mafia boss. This would be the character for beginners, easiest to play since he has access to weapons and is an experienced professional. The ending would be: guy earns money and retires to enjoy a life of leisure, alcohol and whores.
-Bible freak. A family man, model citizen, etc. He loves Jesus and is fed up with modern society straying away from of God. He would get visions of Jesus or God talking to him maybe through TV/radio/phone and ordering him to purge the sinners: whores, drug dealers, pimps...maybe some degenerate quasi-celebrity. I don't have an idea for an ending here...
-Nutjob. Just some random sick fuck. A fat redneck living in a trailer with his dog. His dog would talk to him and order him to kill. He would do crazy stuff, various type of torture, feeding his dog with human flesh. You would eventually get caught. The last section of his storyline would be the player assuming the role of the lawyer trying to persuade the court to send this guy into a mental institution instead of executing him.
-The occult killer. A young omega turbodweeb working a dead end job, a pizza boy or something like that. He would be some kind of goth/metal freak. His "adventure" starts when he aquires some weird occult book and starts performing rituals described in it. Of course these rituals require sacrifice, it would start in an innocent fashion: spiling some of your own blood, killing a small animal then progress into ritual killing of humans (maybe finding cute virgins to sacrifice to Satan or some other foul creature). After a few murders he would get followers (other dweebs and fat goth girls) and become a leader of a small cult.
You would have to boost your influence on the group by organising ritual murders and preaching, talking with your followers (choosing right dialogue options). Once you have enough authority you can get to the final mission - organising a group suicide. Of course there would be an option not to drink the Kool-aid and just walk away and return to your old dweeb life.
-"The professor". An older, educated, man. The player would get his mission objectives through cutscenes showing the guy writing his manifesto. Killing degenerate youngsters or maybe corrupt bureaucrats, corpo-rats...or maybe l1berals, hippies and racemixers...or game journalists
...I don't have his ideology figured out. The objective will be to get caught by the cops after killing enough people and finishing your manifesto. In the end you get sentenced to death but if you publish your manifesto before getting caught, the ending cutscene will tell you that you inspired some followers that continue your noble work.
-The cannibal. 30-something semi succesful corporate rat. He would have hallucinations of people telling to him that they want to be eaten. Maybe one of his co workers would be first, some cute girl telling you that she wants to be your lunch...After a few killings your objective will be to find someone who would like to eat you. Maybe there could be some in game pseudo-internet for this.
I came up with this stuff with my friend some time ago, when we came up with a stupid idea "let's make a game". Of course nothing came out of this except from some drunk brainstorming. I don't think this idea could work, it would be very difficult to make because of the free-form nature.