@Sorunome:It looks like you've made a lot of progress on this, nice work! =)

Well, you asked for ideas:

Mathematician: he can sacrifice himself during the day and then choose a group of people and gets answered how many of them are murderer.
Gardener/Miller: The Detective thinks he's of the mafia.
Cleaning Lady/Godfather: Opposite of the above.
Driver of oil-tankers (seems like translation is serious business  ) : when he dies, his neighbours also die (needs an arrangement of the players in a circle... or any other graph if you want to make simple things complex ).
Freemasons: Normal Townspeople who know each other.
A variation of the jester/Fool: he gets sharpened when the mafia tries to kill him (he survives this (first!) attack). He wins, when he is sharpened and is killed by vote. So he dies, when the mafia kills him twice or the town kills him before he is sharpened.
Matchmaker: During night he chooses two people and get the information whether they are in the same party.
Liar: He votes for the person to the left (or right, also needs an arrangement).
Three-headed monkey: He is just a distraction.

Okay, so here some clarification:

Freemasons are just ordinary townspeople, so they have no special ability, but they know every other Freemason (it is equivalent to the murderers, who also know each other, so they know during daytime which other persons are on there side).

The mathematician is on the "good" side, and can help his side by sacrificing himself for information (as described below/above... oh directions are so relative), he chooses a group of people and the GM/bot returns the number of murderers in this group). He has no real advantage of this information, as he then is dead, but the others can use it for the discussion/vote.

The Liar votes for another person (left/right neighbour of the person he appoints) in every vote he participates. So he can choose a different one. (I do not know if you plan to have a secret vote, but afaik they are public).

For the Fool: He has to different states: sharpened and unsharpened. At the begin of the game he is in the latter state. If he is killed by vote during daytime, he is dead an is unable to win. If he is killed in the night by the mafia he gets sharpened (the GM/Bot tells him, if this happens, he survives this attack). If he is sharpened and then is killed by vote he wins (or is the only survivor), otherwise he loses (so if he is killed by the mafia again).
The only gray-zone that could happen, is if the healers heals the fool in the same night he gets sharpened. This case is a GM dependent, so you can implement that as you wish.

(as if you couldn't implement anything as you wish )

Hope that helps.

as he wishes... it is a bit selfbalancing: if the group he chooses is too large, he doesn’t get very valuable information (as in under these 14 people 5 are murderers), if it is too small, chances are, that he is not very helpful (as in random townie is good, so that's great, but it is not that helpful that others had to die for it)...

But don't think that the roles are so strict as I describe them here, these are how I know/play them. For gameplay and balancing reasons it is often reasonable to adjust them, for example by making the terrorist known to the murderers, disallow the healer to heal himself, and so on. So be encouraged to just take these rules as consideration and adjust them as you please.

This reminds me of an existing IRC MafiaBot on Rizon (sorry if you think this is advertising, trying not to make it seem that way).
It's really complete with scripts and a lot of roles, as well as several commands and leveling.  You should check that one out for ideas. (Mafbot.com)

Good luck developing a good mafiabot

edit: If you want to know some roles from that mafbot, here they are:
Civilian: Doesn't do anything but watch and vote (until Lvl 4 where they become a good role)
Killer: Well, kills.  Works alone, unless someone invites him to help.  Can't be killed unless by a kill_killer command or hanged
Mafia: Kills.
Detective: Checks people and is able to kill people

These are the roles that start to get added in when there are more players
Mafia's snitch: Works like a detective and sees what the other people's roles are
Mafia (again)
Homeless Bum: Works with detective, checks people
Schizophrenic: Sees if people are 'asleep' or not. Asleep means they are a role that doesn't do anything (civ) not asleep means they do something.  20% wrong
Doctor: Heals
Prostitute: Sleeps with players, which figures their roles, is a neutral role, can infect with AIDS
Mafia's lawyer: Watches a player so that if hanged, will be considered innocent
Mafia's agent: Prevents players from checking whoever the agent watches (they get the wrong answer.  check maf and get civ or something)
Drug lord: deals drugs, figures what roles people are, neutral
Hacker: Hacks and publicly tells what the victim's role is, unless faked
Hitman: Kills people when requested

Extra's (after dead)
Ghost: tries to kill who killed him.  Doesn't work otherwise
Farmer: Can kill anyone, however misses like 90% of the time
Crackhead: A zombie revived by  druglord that does what the druglord orders

And this is only the basic stuff, nevermind when the roles start leveling up

yay I'm not the only one that forgot my password

Just a word of advice: build a framework before building the bot!

When I was coding AtomBot (and subsequently its clones Lua2TNS and AtomASM), my code became so unmanageable that I simply gave up and started anew (which also hasn't really gone anywhere ). For me, I was just writing a command based bot - you're writing something more complex!

Basically, you should have some kind of system (an OOP one is nice) that handles commands, server communication, etc. Then you can be sure that you cover all of the possible communication cases, and have a solid foundation to build on!

If you already have done that... kudos to you! You've done something I should have done a long time ago...