Workshop

Adeptus Mechanicus is legal.
Which chat? It's a city, meow?

Well, I would kill)))
In general, she submits a request to the GM to use her special ability, after which she is given the right to make the last post. And then she's done - she leaves the game.
The last post in the general chat, something like "I'm a citizen, I'm leaving the game. I checked him - he's a Mafia member!!!"
Whether to believe her words or not will, of course, be unclear. Since reveals are allowed. But in the evening newspaper, everything will be confirmed, as this reveal, as well as the reveal of the businessman, cop, and agent, are considered official. At the same time, if the last two players use their special abilities, the target dies immediately, i.e., she receives a message about her death and cannot write in the chat. I will try to publish the reveal of the agent/cop immediately so as not to confuse the city.

Maybe leave at least a 50% chance of not leaving clues?

Manics rarely win, you have to agree) Although, in general, this is a very good option; then there will be a point to the Cleaner's special ability - Liquidator. I will most likely do that)

Majority or standard half of the players + 1?

A standard player's vote counts as 1. A double vote can be given to a deputy, mayor, or mafia boss. At the same time, this will be visible in the evening newspaper with the total vote count. Moreover, if, for example, two players voted, one of whom is a revealed citizen with a revealed role, and the second has a double vote, then, after reading the evening newspaper and seeing the number of votes = 3, it will become clear what role the second player has. (Because there are only 3 of them)

Traditionally, immune players are not killed in the first night, so you can not make exceptions for the manic.

But this is a manic! He is not familiar with the concepts of honor; he is inadequate and does not listen to anyone or anything, including the rules of the game) (Maybe I'll think about it, after all, there are traditions and all that)

The set seems interesting, but at the same time, it's quite strange. We usually have a slightly different arrangement of special abilities. I think it might be very interesting.

Is it a different arrangement? There don't seem to be any new ones. And if the question was about the order of special abilities, then yes, there may be some discrepancies, although I tried to make everything more or less logical.

Thank you.