Sivir
The Battle Mistress
wincon: eliminate all threats to the town
"Coin may buy you skill for a day, but never loyalty."
[Passive - Sellsword] - Sivir is a mercenary who fights for the highest bidder, which just happens to be the town. When Sivir dies, this ability and her win condition are hidden from her role. If Sivir is alive when the mafia would win the game, she will win with them.
[Active - Ricochet] - Sivir can throw her gravity-defying glaive at another player, roleblocking them for that night. If Sivir's victim attempted to target another player, Sivir's blade will find them the following night, roleblocking them and telling Sivir their name. Sivir's blade returns to her two nights after she uses this ability, and she cannot use Ricochet or Spell Shield until it returns.
[Active - Spell Shield] - During the night Sivir can use her enchanted weapon to ward against magic, causing magical abilities to fail on her. If Sivir successfully blocks an ability, she will learn the ability's effect and the name of its user, and Spell Shield has no cooldown. If Sivir used Spell Shield but doesn't block an ability, then she cannot use it again for the next two cycles.