Board Thread:Role Ideas (Neutral)/@comment-26959384-20161108152544/@comment-25876622-20161108185352

These are the similarities with Vampires:

Night immunity - Vampires: no. Fairies: one of them

Conversion mechanic - Vampires: direct visits. Fairies: have to be visited twice.

Number of conversions - Vampires: One per two days. Fairies: Depends on visits.

Conversion immunity - Vampires: fewer. Fairies: Mafia, Jailor, non-visiting roles. NK, Exe, GF, Witch and Mafia are conversion immune.

Killing - Vampires: Mafia non-GF. Fairies: none.

Abilities - Vampires: none. Fairies: Replaced roles keep all of their abilities.

Counters - Vampires: Vampire Hunter. Fairies: none, nobody can directly kill them or hear their chat.

Now the important part - what is their goal? Are they a new faction? If yes, then there are some issues:
 * Fairies can't be found by Investigators (invest results don't change), Sheriffs (not suspicious), Spies (not Mafia), Lookouts (use regular abilities), Vampire Hunters (not Vampires).
 * Fairies vs. Town: Fairies always win lategame, because none of the TIs have a way to differentiate fairies from non-fairies.
 * Fairies vs. Mafia: Depends on the remaining roles. In most cases, Mafia will win because of the killing ability. Fairies can win if they have the majority.
 * Fairies vs. NK: Fairies will win easily because of team awareness.

TL;DR main points:
 * Fairy numbers can increase very quickly or not at all, depending on baiting effectiveness. Good for strategy!
 * Fairy abilities plus shared chat and team awareness is similar to Mafia, but with Town abilities. Nice!
 * Fairies cannot be found by Sheriffs, Investigators, Spies, or Lookouts. They also have no counter role. Overpowered!
 * Because of the above points, Fairies will win most games:
 * NK are lynched because Fairies know their teammates.
 * Town are lynched because Fairies know their teammates.
 * Mafia win against Fairies if they aren't outnumbered 3 to 1 because of their killing ability.

I believe the Invest result needs to change. They are completely undetectable and have team awareness, which allows only Mafia to win against them. Since they can use their abilities to work together with the Town to wipe out the Mafia first, they can win most games unless they are unlucky and are killed by Mafia/NK. An Invest or Sheriff who is aware of a Fairy does not have immediate reason to lynch them.

And one more thing: The possibility of consciously switching your team from Town to Fairies (by visiting them) may alleviate gamethrowing.