Role Name: Operative / Infiltrator
Alignment: Town / Mafia
Game Size(s): FM / M-FM
Abilities: During the day he can choose one person to track. If that person has a night chat he will infiltrate their organisation and take their place in the night chat. He will be able to speak through that person's account and will only be able to see the current night's chat. All of the other participants will be anonymous to him. He will infiltrate as many night chats as his target is currently in. Detection immune roles are immune to infiltration.
The operative / infiltrator can also falsify a night chat for someone each day. If another operative / infiltrator targets someone who is falsified he will be able to feed them with posts supposedly coming from a real night chat. If he falsifies a night chat of someone already in a night chat, the operative / infiltrator will see both the real night chat and the fabricated night chat as he would for multiple night chats.
Additional Notes: The operative can be used to find people with night chats. The most common being mafia or cult. The mafia and cult may end up telling the operative all their names and what they are going to do that night. To prevent this they could setup a code word that every member must say before they can speak freely. The operative will probably be discovered by this but he could pretend to be AFK until the mafia start speaking. Even if the operative is found he will still disrupt the night chat as mafia will not want to give him information about their night actions. They might be forced to choose a night action themselves without discussion with their teammates which might cause confusion the next day as they would not have known what actions they did. He also prevents the person he infiltrates from speaking so they can not give information or help to their team.
A tactic the mafia or cult could use is pretending to be masons, a jailor and his victim or an architect chat. This could throw the operative off their scent and may even get him to reveal his name to them so they can discuss tactics.
By infiltrating two night chats at once he will know that that person is a culted jailor, mafia or architect. An operative has the potential of working with the masons, the jailor or the architect to create a network of confirmed town but it will be hard to get them to trust him with the possibility of an infiltrator.
If an infiltrator invades a mason, jailor or architect chat he will do his best to get them to reveal their names to him so he can tell the mafia who to kill. Mafia can claim operative like they can claim spy in SC2 mafia because they know everything that is being said just like the operative does. An infiltrator would be especially good at claiming operative because he might have been in other chats as well and could bus a mafia teammate to make himself unsuspicious.
If the infiltrator takes the place of the jailor or architect he will try to force his captive or the other people in the architect meeting to claim to him or he will threaten to execute them or lynch them the next day. As the architect and jailor are some of the most trusted roles in the game players are likely to reveal to them and give the mafia info for night kills. This also gives players an excuse for not revealing to a jailor or architect. The jailor will still be able to execute and the infiltrator can only speak as the jailor and not do any actions.
The infiltrator might want to track his own mafia teammates to find out if they are culted.
Technical Details: I don't know loads about how the forums work but the operative / infiltrator would probably have to be in a separate forum with different topics for each night chat. The GM would copy everything that is said in the night chat he has infiltrated into this forum for the operative to read anonymously. The operative can then post in this forum and the GM would make the same post using the account that has been infiltrated.
There will be another topic for the falsified night chat where the infiltrator can make posts that will be sent to any other infiltrators watching. The GM would post any replies made by other infiltrators.
One Sentence Summary: Invades night chats to find clues and to disrupt its participants.