Bring Your Own Role Mafia. Basically, you pick the name of your role, and I pick how it acts and interacts with other roles. Any name shall do, and if it is obscure, a link to a data source might help. ...But please not TOO obscure.
This is otherwise known as U-Pick. I shall do my best to insure playability and avoid broken games.
Therefore, let's play!
As for rules:
PMing: Disallowed (Mafia ONLY)
Hammering: Disallowed (Timed Days)
Quoting Mod: ALWAYS Disallowed
ToonyMan - Presidents Roosevelt
Mr.Person - Billy Mays
Cheeetar - Dave Strider
Pandarsenic - Robot Zombie Ninja Pirate Communist Alien
CobaltKobold - Vizzini
SHAD0Wdump - Man with a Pickle Jar
Leafsnail - Suigintou
Vector - Bernhard Riemann
Apostolic Nihilist - Ace of Spades
dakarian - Nuclear Physicist
Org - Ursakar E. Creed
Zai - Elmo with a Spider
eduren - Sparticus
Robot Zombie Ninja Pirate Communist Alien
... Something went horribly wrong. Not only are you a combination of organic and inorganic matter, you're also an undead extraterrestrial belonging to obscure organizations of humans (Which you're probably 1/8th maybe), and believe in a government system originating from Earth.
Each Night, you may give one of the following attributes away for one Phase: Robot (Gains all abilities used on that person), Zombie (Unlynchable), Ninja (Kill-Immune), Pirate (Ascetic), Communist (Kill Magnet), and Alien (Randomises anyone that targets them). You may only use each attribute once. Attributes may affect others differently.
Elmo with a Spider
Lala lala. Lala lala. Elmo's world. I guess Spider must be a friend of yours.
Each Night, you can choose to switch yourself with your Spider. The Spider is Kill-Immune, but any non-Kill actions will kill it. If your Spider dies, you die.
Spartacus
You're Sparticus! No, he's Sparticus! No, HE'S Sparticus. Now that's confusing...
Each Night, you can choose someone to be Sparticus. All actions targetting you will target him, and all actions targetting him will target you.
Nuclear Physicist
Psh. You're a Nuclear Physicist. Not like you can compare to a Brain Surgeon or anything.
Each Night, a radioactive isotope attaches itself to a random person. This person and any person that interacts with this person will show up as radioactive the following morning.
Ursarkar E. Creed
You are the current leader of the Imperial forces of Cadia... And some other crap. I don't care. This guy has some crazy history...
As a battle-scarred general, it takes a little more to kill you. You will revive once upon death.
Vizzini
You're the orginial WIFOMer. However, you were cheated when that came up. So now, you're going to cheat.
Each Night, you can WIFOM someone. This causes them to spend so much time figuring out that there's not poison in either of them that they waste their Night. However, you may choose to poison BOTH the glasses, in which case, both you and your target will die.
Extra: Becoming a Pirate might be a bad thing...
Presidents Roosevelt
We have nothing to fear but fear itself. And the mafia. Seems you'll need to speak softly and carry a huge stick. It seems Grandfather and Grandson are working together on this one.
Each Night, you can be either Theodore or Franklin. If you are Franklin, you will be Kill-Immune. If you are Theodore, will be Unlynchable. However, when in either mode all non-kill abilities will fail against you except inspects, which will bring up Mafia. You cannot choose the same role twice in a row.
Oh, and you are a Survivor.
Extra: Becoming a Communist might be a bad thing...
Man with a Pickle Jar
Try as you might, you're not getting that jar open. It's on there tight.
Each Night, you can either ask someone to open your Pickle Jar or try to open it yourself. If you ask someone else to open the Pickle Jar, they automatically target you. If you try to open the Pickle Jar, you have no vote the following Day.
Extra: Becoming an Alien might be a good thing...
Billy Mays
Hi, Billy Mays, here with an interesting mafia role!
Each Night, you can give a player a random one-shot ability (Either Protect, Block, Kill, or Inspect).
Extra: Becoming a Zombie might be a good thing...
Suigintou
So... basically an Evil Female Doll thing with wings and no abdomen from another dimension? I'm not entirely sure.
Each Night, you may choose to kill someone. However, if you kill someone, you have no vote the following Day, mostly because it's probably blatantly obvious you killed the person.
Extra: Becoming a Robot might be a bad thing...
You're also an SK
Ace of Spades
You are otherwise known as the Death Card. You rank highest among the the other Cards, even higher than the Queen of Hearts herself. It is this that makes you powerful.
Once per game, if you perform the Nightkill, you can ignore all other roles protecting the target or stopping you.
Bernhard Riemann
Being a German Mathematician, you excel at Mathematics. And German! But Mostly Mathematics.
Each Night, you can choose a player to mathematically prove yourself town.