I've decided to break into the hosting business (you guys do get paid, right?), and to do so I'll be adapting one of my favorite books ever, the Hobbit, to mafia. Here's a brief description of roles:
Win Conditions: defeat Smaug and all the baddies, and win back the Dwarves' ancestral home and treasure!
No BTSC, except where noted.
Bilbo Baggins

Possessor of the Ring and the dwarves' burglar, despite being a homebody. Initially doubted by the dwarves, he continually goes up in their estimation.
Gains +1 vote every 3 Day periods. May have the opportunity to burgle from Smaug.
Gandalf

Wizard and friend to Bilbo and the dwarves. Known for his smoke rings and fireworks. Wields the sword Glamdring, the Foe-Hammer, known to the Goblin Town Goblins as Beater.
May send messages to players via PM nightly. Also knows magic spells. (Secret)
Beorn

A shapeshifter who lives east of the Misty Mountains. Dislikes dwarves, but despises goblins and wargs.
Twice per game, may transform into a bear. As a bear he may opt to kill, or to protect 3 players from Night actions.
Bard

Lake Town resident, charismatic leader, and valiant archer. Also Smaug's killer.
(Secret)
Thorin Oakenshield

King of the Dwarves, rightful ruler of the Lonely Mountain, experienced fighter, and leader of the expedition to defeat Smaug.
Protects a player nightly with his oaken shield. (Secret)
Other Dwarves

Kili
Brother of Fili. The two youngest dwarves have the sharpest eyes of the group.
Uses his good sight to see manipulations during votes. Targets a player once per day and learns what their vote counted for.
Fili
Brother of Kili. The two youngest dwarves have the sharpest eyes of the group.
Uses his good sight to see what happens at night. Targets a player and sees who else targeted them during the same Night.
Dwalin
Brother of Balin and one of the two eldest dwarves.
Because he is so old and wise, he is an experienced riddler. May receive hints to riddles during the game.
Balin
Brother of Dwalin and one of the two eldest dwarves.
Deferred to by the other dwarves. He does not carry a pack and thus walks ahead, receiving information on night polls.
Bifur
Cousin of Bofur and Bombur.
Is often overlooked, and thus will not be affected by non-kill night powers.
Bofur
Brother of Bombur. Often winds up in the rearguard for this reason.
Prevents a player from voting in night polls or answering riddles every night.
Bombur
Brother of Bofur. Fattest, slowest dwarf, tends to sleep through important events.
Forces a player to carry him every night, rendering them incapable of carrying out other night actions.
Dori
Brother of Nori and Ori.
BTSC with Nori and Ori. As long as all 3 brothers survive, they may add 1 to any player's vote total per day. If 2 brothers survive, they may add .5 instead.
Nori
Brother of Dori and Ori.
BTSC with Dori and Ori. As long as all 3 brothers survive, they may add 1 to any player's vote total per day. If 2 brothers survive, they may add .5 instead.
Ori
Brother of Dori and Nori.
BTSC with Dori and Nori. As long as all 3 brothers survive, they may add 1 to any player's vote total per day. If 2 brothers survive, they may add .5 instead.
Oin
Brother of Gloin. Noted for his skill at firemaking.
Lights a fire each night that interrupts BTSC. Targeted player/player's group loses any BTSC for the next day period.
Gloin
Brother of Oin. Noted for his skill at firemaking.
Stokes a fire each night, which illuminates clandestine conversation and makes public a random snippet of BTSC.
Indies
Win Conditions: survive to the end.
No BTSC.
Gollum

A pitiful, miserable creature and the owner of a Ring of Power (these facts are connected). Lives alone in a cave, eating raw fish and practicing riddles.
Secret
Mayor of Lake Town
Men's hearts are greedy and lust after gold. Their loyalty is for sale. The influential Mayor is no exception.
The Mayor accepts bids for his vote, which is worth 3, nightly. He can use the gold he earns to buy armor and gain protections.
Smith of Lake Town
Men's hearts are greedy and lust after gold. Their loyalty is for sale.
Accept bids for his vote nightly. (Secret).
Baker of Lake Town
Men's hearts are greedy and lust after gold. Their loyalty is for sale.
Accept bids for his vote nightly. (Secret).
Lake Town Gossip
Men's hearts are greedy and lust after gold. Their loyalty is for sale.
Accept bids for his vote nightly. (Secret).
Lake Town Drunk
Men's hearts are greedy and lust after gold. Their loyalty is for sale.
Accept bids for his vote nightly. (Secret).
Wood Elves
Win Conditions: Wood Elves begin as an indy team, able to win with any team. Their alignment may change based on Wood Elf Points, which quantify their relationship with other factions.
Have BTSC with each other.
Wood Elf King
Ruler of the Wood-Elves, he engages in trade, but is distrustful and slow to form friendships.
Sends Gold to a player of his choice nightly. (Gives Wood Elf points as well.)
Wood Elf Scout
Protects the borders of the Elven settlement east of Mirkwood, especailly against giant spiders.
Redirects night actions taken against the target to a random player. Gives Wood Elf Points if successful.
Wood Elf Gaoler
Protects the Wood Elves from men and other thieves who would have their treasure.
Jails a player nightly, rendering them unable to post or vote the next Day. Subtracts Wood Elf Points if successful. (Secret).
Wood Elf Vintner
Makes the Wood-Elves' (in)famous wine, the effects of which are notorious.
Invites a player to drink with him nightly. The vintage is unknown to the recipient. Is insulted if a player refuses his offering. (Secret).
Goblin Town Goblins
Win Conditions: Outnumber or kill the Dwarves and their allies, kill the rival Moria Goblins, and defeat Smaug.
Have BTSC.
The Great Goblin

Ruler of Goblin Town, deep in the Misty Mountains.
Directs the kill for his team on odd nights. This power will pass to his appointed successor if he dies. (Secret.)
Goblin Torturer
Goblin specializing in making and using instruments of torture.
Insanifies a player each night.
Goblin Thief
A sticky-fingered goblin.
Robs a player (except Smaug) of their Gold nightly.
Goblin Sapper
Goblin with an affinity for fire and explosives.
(Secret).
Goblin Inventor
Goblin who creates mechanical devices with devious purposes.
Creates items such as armor and weapons for his tribe.
Moria Goblins
Win Conditions: outnumber or kill the Dwarves and their allies, kill the rival Goblin Town goblins, and defeat Smaug.
Have BTSC.
Bolg

A fearsome albino goblin warrior, who killed Thorin's father outside of Moria.
Directs his team's kill on even nights (the kills continue if he dies, however). (Secret.)
Bolg's Warg
Chieftain of the Wargs, the steeds of the goblins. Albino like Bolg, it is a fearsome, wolflike beast.
May injure a player's pony each night. The player will have to walk the next day and will be too tired to vote.
Goblin Sapper
Goblin with an affinity for fire and explosives.
Every night, can plant bombs on other players. These have a 1/3 chance of killing a voter at random if the chosen player is lynched.
The Necromancer
A shadowy, ominous presence that rules the southern reaches of Mirkwood.
Every second Night, may turn his Eye upon a player, learning their role. (Secrets.)
Rogue
Win Conditions: kill everyone to protect your treasure.
Smaug the Dragon

Also known as Smaug the Deceiver, this fat dragon hoards a fortune in gold and precious jewels under the Lonely Mountain. Though only remembered by the dwarves and the oldest residents of Lake Town, this mythical creature is still the terror of the East. He is covered in impenetrable armor and can breathe gouts of flame.
Secret
Right now we're looking at 37 roles, though that can be cut to close to 30 if there are problems getting enough people to join.
The story picks up just east of the Misty Mountains, after a daring escape by Bilbo, Gandalf, Thorin, and company, as the group arrives at Beorn's house. Night polls have various results and may not occur every night. There will be riddles some nights as well, with rewards for correct answers.
One unusual thing is, because of Gloin's power, I will need access to all BTSC chats, so I will likely make it mandatory that we use Chatzy for those. If you don't like it, don't be a baddie.

This will be a complex game, so I'm expecting to have my hands full as a first-time host. I'm really looking forward to it and hope you guys are as excited as I am!