As Rai Rai Raichu, I won 3 times as a Witch, ALONE, by making the mafia kill thenselves and lynching the last mafia together with the last townie. Town will prefer to make Witch win alone, rather than letting mafia win.

On the first time I did that, I was actually an Amnesiac, who claimed the dead witch role. I make a Disguiser to target a Veteran, and both Godfather and Disguiser died. Witch loves revealed veterans!

On the first time I won as a Jester, it was the game, when I claimed being a lookout. I said that two people visited a person, who was killed by Mafia. Town lynched one of then, and he turns out to be a Jailor.
On the next day I pretended being blackmailed. Seeing that, most of the town voted "inno" on me. I then purposely leaked some words in the chat, and they "What? you talk?", put me on trial. My words on the second trial was the same.
I am blackmailed.
Everyone immediately thought that I am a fail mafia, and lynched me. As usually, people becomes surprised afterwards.