Survivor

Mechanics

 * Using a vest gives you temporary Night Immunity.
 * Even if you are not attacked, your vest will be destroyed.
 * When you are transported, your vest will still affect you.
 * If a Witch controls you, you will use a vest instead of visiting anyone, regardless of who they try to target.
 * You will not use your vest if you are role blocked.
 * Whether or not you use a vest, if you are bitten by a Vampire, you will turn into a Vampire.
 * Your bulletproof vest does not protect you from being doused or ignited by an Arsonist.
 * Survivors still win in the event of a Draw.

Strategy
The Survivor is one of the toughest roles to play as despite how easy the conditions might seem. Despite your only goal being to survive to the end of the game, there are several things that could go wrong. Evils might think you're a Neutral Killing trying to get away with a Survivor claim, and the town doesn't have to consider your existence for their secured victory. However, being a free-willed loner also gives you the advantage of not caring who you win with.

When to use your vest

 * If you feel your life may be at stake one night, be sure to wear the vest and protect yourself. (This does not protect you from the Werewolf attack or Arsonist activity).
 * The more people are left alive, the less the chance that you will get randomly targeted. If you do not plan on claiming Survivor, save your vests until you feel it is too dangerous to sleep unprotected. If you do plan on claiming Survivor, feel free to use a vest or two early to make sure you don't get killed before claiming.

Claiming Survivor

 * If you choose to claim Survivor (before being forced to by a possible Investigator):
 * Players are more likely to believe that you are Survivor if you say so in advance rather than as a response to an accusation of immunity, although you are likely to be inspected by a Sheriff or Investigator to confirm your status. Some players have reported success in immediately announcing (first day) that they are the Survivor, then voting with the largest team each day, whether Town or Mafia.
 * If there is no Arsonist, you can ask to be jailed. This will prove you are not a Serial Killer or Werewolf. The danger is that rather than risk being killed, the Jailor might simply decide to execute you...
 * Some Townies will lynch Survivors because they don't trust you or to make sure you will not side with their enemies.
 * Remember, ALWAYS consider if you think revealing as a survivor is worth it. If you really think about it, you are just a neutral to the town. There is no real reason for town members to not lynch you, as for the most part, survivors partner with evil roles. Due to this factor, think about if it's really worth revealing. But you must think fast, as claiming survivor later on in the game is generally more suspicious than claiming earlier.
 * If you do claim Survivor, it is extremely important to help the Town catch the Werewolf, since you will otherwise become the first suspect.
 * The Jailor may execute you on suspicion of you being a Witch, Werewolf or even Mafia. If you're jailed before publicly claiming a role, it's usually a bad idea to tell the Jailor you're a Survivor (since, having already wasted their night jailing you, they have little incentive to not just execute you if you're clearly non-Town.) In that situation, come up with a suitable Town role instead, ideally with a fake will.  Note that this is just for when jailed -- it is generally a bad idea for Survivors to claim Town roles publicly if they can avoid it (since you also need to avoid getting targeted by the Mafia.)
 * Smart killers are likely to pass you by if they feel that they have more important targets (i.e. everyone else), and the Godfather may see you as a late-game voting asset.
 * Occasionally, someone else may claim Survivor. This person may be an actual second Survivor, a night immune killer, a Jester or even a Townie.
 * If you doubt the existence of a fellow Survivor, make sure to claim your role as well. If you do not, you may get lynched later, since the other claim seems more trustworthy.
 * You can also choose not to challenge their claim and see what happens. If you feel adventurous, you can whisper them about being the real Survivor and ask them not to kill you (in case they are a killer).
 * If you suspect them of being a night killer, you can try to convince the town to lynch them; if you catch a Werewolf this way, you can usually safely reveal that you knew they were lying because you're the real Survivor. This works best, of course, in role-lists where only one or two Survivors are possible.
 * If you do not want to risk being targeted because you are a Survivor, you can choose not to reveal yourself early. Waiting until a Sheriff or Investigator checks you is usually your best bet. When they ask during the day, tell them your role as quickly as possible to avoid accidental lynching.
 * It's often a good idea to claim Survivor after the Werewolf is caught, especially if nobody has been reporting being Witched; since Werewolves are unique, the only other option in your Investigative result is the low-priority Witch, making a Survivor claim much less likely to draw the Town's ire.
 * A Transporter is a huge threat to you after claiming Survivor; since they know you're not Town and are unlikely to be attacked, they're likely to transport you with themselves or anyone they think is Town. If there seems to be a Transporter, you may want to avoid revealing as a Survivor; or you may want to start vesting once you do.

After blocking an attack

 * If you are attacked at night, and protect yourself with your vest, your troubles aren't necessarily over; whoever attacked you is likely to reveal that you have night immunity, which will make the Town suspect that you are a Werewolf, Serial Killer, Arsonist, or (if not revealed by the Mafia) Godfather. Any of these suspicions can get you hung.
 * One option is to immediately reveal that you're a Survivor after being attacked. Claiming after being attacked is generally more risky than claiming at the start of the game, since the Town might assume you're an evil role trying to explain your night immunity; but it still gives you better chances than claiming after you're accused.  As always, claiming Survivor is safer if the Werewolf is dead (since at that point you're the only role in your Investigative result with even limited night immunity; with a dead Werewolf, the combination of someone calling you out as immune and an Investigator investigating you will essentially confirm you as a Survivor.)
 * You can also wait and see; not every attacker reveals immunity immediately (and they may hit another immune, get roleblocked, etc, preventing their next death note from getting out for a while.) Reacting too quickly might put you in more danger than just waiting quietly.
 * An alternative option after blocking an attack with your vest is to act like an Executioner; claim Sheriff and accuse someone you think is Town. Your attackers are likely to be evil, and if they think you're an Executioner, they might not reveal you, since Executioners are on their side.  This is risky (you could get hung as an executioner or exposed by an Investigator, among other things) but it's preferable to getting hung because the Mafia thought you were a Serial Killer, Werewolf, or Arsonist.
 * You can also claim Bodyguard, since they also have a vest; however, since they only get one, this can be a harder thing to convince the town. It also violates your Investigation results.
 * Claiming you were healed might cloud the issue a bit, but be warned that it will not fool whoever attacked you; people who are healed produce no message for the attacker, while your vest produced a standard "your target was immune" message. Fortunately, Mafia and Serial Killers can't easily explain their accusation and say they got the message, so if anyone points out the discrepancy, you can just say your attacker must not have known.
 * You can also claim to have been Transported, but it's usually obvious when there's an active Transporter, and people will generally expect the transporter to step forwards and substantiate your claim anyway.
 * Claim Amnesiac. Not only will you still be a neutral benign, but people will be reluctent to kill you because killing an amnesiac means killing a potential ally.

Who to side with

 * Although your bulletproof vest will save you from most attacks, you can't avoid being killed by Werewolf, Arsonist, Jailor and/or Jester. It's usually a good thing to get rid of these four roles or guarantee siding with one of them.
 * However, if there is a Werewolf, people may try to kill whoever said to be Survivor. Once the Arsonist doused you, you can't ally with them anymore. If Town starts suspecting you, the Jailor will most likely execute. Even if you didn't vote guilty for the Jester, the Transporter is able to sacrifice you. Be careful of any of these situations and, again, it's usually better just eliminating these four harmful roles.
 * If you claim Survivor, townies will expect you to vote with them. On the other hand, Mafia might kill you if you vote against them.
 * The faster the game ends, the better, it doesn't matter who you sided with. You are only night immune in four nights, so speed up the game. A nice way of doing it is voting on anyone that already received a vote, since it means that people will die sooner and the game will end sooner. However, avoid voting guilty since it may turn you into a target for the team of the lynched person AND you may end up killed by a Jester. Another advantage to voting up anyone who starts getting significant number of votes is that, should you vote up a Mafia member, it will usually clear you of suspicion of being part of the Mafia.
 * If Mafia finds you and you refuse to assist them in voting, they may kill you the following night as retaliation.
 * The Witch can be your greatest ally - helping to deflect possible deaths and overall aid your survival, especially if you plan on winning with Mafia, as a friendship with the Witch can easily become a win later on. Try to communicate sparsely, though, as a Spy will certainly catch on to your plans and call you out to the Town.
 * Occasionally, joining forces with evil will ensure you survive both night and potential lynching at day. Be sure to make friends with all sides to see yourself winning by their side. Joining the largest remaining faction is also a good way to ensure victory on both ends.
 * Sometimes, if you really don't know who to side with, it's often best to just not side with anyone at all and give up voting rights. Doing this allows you to avoid "joining a side" and will allow you to avoid making unknown enemies.