Roles are any of the randomly-assigned attributes players receive before a shooting of Betrayal begins. In Betrayal.io, unlike Among Us, these roles are provided at random, with no favor for the host, players who remain in lobbies for long periods of time. In short, roles are assigned at complete random and probabilities of getting roles tend to be constant for the amount of lobby players and whether Jesters, Sheriffs, and Mimic Betrayers are permitted.
Role Probabilities: Core Mode[]
In Core Mode, the only available Betrayal.io gamemode for public lobbies, Mimic Betrayers are not permitted.
| Lobby Characteristics | Probability of Becoming a Crewmate | Probability of Becoming a Betrayer | Probability of Becoming a Jester | Probability of Becoming a Sheriff |
|---|---|---|---|---|
| No Jester, No Sheriff | 78% to 92% (7/9 to 11/12) | 8% to 22% (1/12 to 2/9) | 0% | 0% |
| Jester Available, No Sheriff | 67% to 83% (4/6 to 10/12) | 8% to 22% (1/12 to 2/9) | 8% to 17% (1/12 to 1/6) | 0% |
| No Jester, Sheriff Available | 67% to 83% (4/6 to 10/12) | 8% to 22% (1/12 to 2/9) | 0% | 8% to 17% (1/12 to 1/6) |
| Jester Available, Sheriff Available | 50% to 75% (3/6 to 9/12) | 8% to 22% (1/12 to 2/9) | 8% to 17% (1/12 to 1/6) | 8% to 17% (1/12 to 1/6) |
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