Investigator

After working in the city for thirty years, the Investigator returned to his home town of Salem for some peace and quiet. But when bodies start turning up with the mark of the Serial Killer, he knows his work is not finished. Sneaking out under the cover of night, he quietly searches houses for clues to who his target really is.

While he searches the house of the Doctor, he finds an uncleaned knife covered in blood. The Investigator is almost certain that the "Doctor" is actually the Serial Killer. He waits a few days to see who dies, and what other clues he can dig up about other town members, but he finds nothing as incriminating as what he found at the house of the Doctor. He decides to call out the Doctor, accusing him of being the Serial Killer.

As the Doctor presents his defence, it looks increasingly like he is innocent. Even the Investigator begins to doubt himself. The Doctor is pardoned on a vote of 7 to 2. That night, as the Investigator looks for clues as to the mysterious Werewolf, he is ambushed. The next morning, he is found outside with the mark of the Serial Killer carved in his chest.

Stats
Role Name: Investigator (Invest)

Role Alignment: Town Investigative

Abilities: Attributes: Goal: Lynch every criminal and evildoer.
 * Investigate one person each night for a clue to their role.
 * None.

Actions
Sun Icon: N/A

Night action: Investigate another player.

Target Self: N/A

Target Other: Find a clue to your target's role.

Secondary Target: N/A

Strategy

 * Always consider if it's worth exposing yourself as Investigator. Once other players know you are an Investigator, you will be a target. But if you know that you have Town Protective roles, revealing yourself as Investigator early and giving everyone information about suspicious bad guys can help Town win.
 * Make sure to do your best not to reveal who the Townies are; you could end up making them a target for kill-capable Mafia and Neutral Killings. However, simply posting that someone is good may lead experienced evil players to conclude that the said person is important (Ex. you put that someone is a confirmed townie. The Mafia might suspect that you found a protector, like the Bodyguard/Jailor/Lookout, all of which are very important). Simply omitting their mention in your will would not give the person the trust they need/deserve. Always weigh risk/reward in situations like this.
 * Even if you find a Mafia or Neutral Killings on Night one, don't tell Town about it. Claims on the first two days make anyone seem like an Executioner, and even if you manage to hang the player, Mafia or the Serial Killer will try to attack you as soon as possible, preventing you from discovering more. It is best to wait, writing everything in the will and whispering to known Townies. You can decide to reveal yourself on day 3 or later, but a day 2 reveal is generally unwise.
 * Janitors can be the downfall of an Investigator since they wipe out wills, revealing them only to the mafia (or possibly the Spy). If this is a threat to you, try to find good roles. Finding a Spy or a protector (Bodyguard/Lookout/Jailor) and whispering your findings to them will allow the Town to retain your findings after you being cleaned, if the person you whisper to is trusted by the other Townies. This works especially well with Jailors; an informed Jailor is a lethal one.
 * If you find the Amnesiac, you can whisper to them and tell them that you know that their role and it will be included in your will. This can usually force the Amnesiac to choose a Town role. However, the person might instead choose a mafia role if the town is weakened.
 * If a player you investigated could be good or bad (e.g. Medium/Janitor), sometimes it may be worth it to ask them for their role. If they claim a role that isn't what you got or refuse to give you this info, then they are likely the evil role of the 2 or 3. However, if they are evil and survive the day, you are most likely dead.
 * This is somewhat of an advanced tactic, but record who peoples roles are, and who they "claimed" to be as well in your will, an Arsonist or Transporter claiming Medium on day 2 is a pretty good sign they're an Arsonist because Transporter would have no reason to lie.
 * The Investigator is much more powerful in Classic Mode due to not all the roles being available. So if you investigate someone who appears to "take charge", chances are that they are a Godfather rather than a Mayor or Vampire Hunter. Also, if someone is accused of being evil and you find out that he is "a manipulative beauty", then they are an Escort, as only the Escort is available in Classic Mode. Use this to your advantage to ensure your survival and the cohesion of the town's votes and kills by forming a whisper network.
 * If there is a Sheriff - work together. At daytime, discuss with each other about who you are both going to visit. At night, both of you choose  the same person. For example, if the Sheriff's investigation says "Your target is the Serial Killer" and yours says "Your target is covered with blood. Your target is a Doctor, Serial Killer or Vampire", that person is definitely a Serial Killer (Or the other way around, the Sheriff: "Not Suspicious". Investigator: "Your target works with knives, your target is a Doctor or Serial Killer. That person is a Doctor). Although this does not work in discerning a Mayor from a Godfather, calling a mayor out is usually enough to make him reveal, but only risk revealing a mayor if there are protective roles left (other than Doctor, since the Doctor can't heal a revealed Mayor (or even a Jailor).
 * However, this can backfire, as a Transporter, Witch, Escort, Consort, or Jailor can interrupt your plan. Also if you both visit a Veteran on alert, both of you will die.
 * This could be a waste of time in some games, because there won't be many leads for the following time, but it does work and is doable.
 * Doing the Math for a given Role List can give the Investigator a much greater insight. Take Ranked Mode and the result 'Medium/Janitor' as example: (Ignoring Any, as it has neglectable influence) Janitor can only appear as Random Mafia, as 1 of 7 roles, with 14%. Medium can occur as one of the Town Supports. There are 5 Support roles, so on the first role there is a 80% chance that there is no medium. If the 'locked role' was Mayor or Retributionist, the next slot has a 75% chance of not being Medium (3/4), otherwise a 80% (4/5). This results in a total chance of 62% of 'two not-Mediums', aka 38% for '1 or 2 mediums'. If you now take the 14% of Janitor and the 38% for Medium, and scale them up to a sum of 100%, you get the exact chance that an investigated Janitor/Medium is role X. In this case, its 26% for Janitor, 74% for Medium. Note that his values are EXCLUSIVELY correct the moment you get the investigation result on N1. Every single revealed role changes the ratios (i.e. if a target is cleaned, the chance for a Janitor in the game raises from 17 to 100, turning the investigation odds to 60% Janitor/40% Medium).
 * A less complicated and precise version of the math strategy is simply counting the kinds of roles left and seeing which has a higher probability. (Ex. Someone is a Consort or Escort. One town support role in Ranked is dead, but no mafia. Thus, there is a higher chance the person is mafia since there are two opportunities for the person to be Consort and only one to be escort). Beware random towns and any slots.
 * Someone appeared to be Mafioso, Vigilante or Veteran? Take account if there was any death by Vigilante or Veteran. If there wasn't, the person is a Mafioso or a Vigilante who decided to just shoot people with enough proof. Also, most games (Normal and Custom) just have one Town Killing, so if there is a known Veteran, it's easy to see the Mafioso.
 * In your will as investigator, it's better to use numbering than 'N1 I visited Billy, he was blackmailer or spy' Use a simple will with numbering down the side and what the person with the number appeared as.
 * If someone is shown as Framer or Forger, visit again later to check if they were framed.
 * A nice tactic you can use when finding a result like Survivor/Witch/Werewolf or SK/Doctor, is to whisper and call them forger/framer. This will usually get them to, if they are an evil role, claim a role outside of your results. This will prove that they are Neutral Evil or Neutral Killing. However, this will not work on experienced mafia players, as they know they can't frame each other or in a more likely scenario, there simply isn't a framer in the mafia.