These would be the roles for every V3 character if they were in Town of Salem. I might write in another chapter about how the game would play out.

Bold: Town
Italics: Neutral
Underline: Mafia

30% credit to FreezeArt.
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Boys:

Shuichi: Investigator
Kokichi: Jester
Rantaro: Survivor
Keebo: Arsonist
Ryoma: Mafioso
Korekiyo: Serial Killer
Kaito: Sheriff
Gonta: Amnesiac

Girls:

Kaede: Spy
Tsumugi: Godfather
Himiko: Witch
Tenko: Veteran
Kirumi: Mayor
Miu: Consort
Angie: Medium
Maki: Executioner (Target: Kaito)