The Mafioso is essentially a henchman of the Mafia and the most basic Mafia-aligned role. The role has the ability to suggest to kill people at night; the player that receives the highest number of suggestions will be killed by a random Mafioso that night.
Whilst the Godfather always has the final say on who the Mafia will kill, Mafioso can still use the kill suggestion system even with a Godfather in the game. This allows the Mafia to communicate silently, avoiding revealing information to a Spy (unless the Spy is able to see Mafia targets).
Make sure to suggest to kill if the Godfather seems AFK. He could be jailed, and if the Mafia appears to continue killing, he will be cleared from suspicion by the Jailor as a killing role.
If you are found by an Investigator and are going to be lynched, you can falsely claim Jailor or Vigilante and say you will prove your innocence tonight (it would typically be wiser to say Jailor as a Town member may volunteer to be jailed to prove your claim). While you may inevitably be lynched the next day when it turns out you haven't jailed or shot anyone, the time bought for the rest of your fellow Mafia may turn out to be invaluable, as the Town has wasted a day in choosing not to lynch.
Excluded from randoms - (Default: On)
The Godfather overrules the suggestion system, forcing a random Mafioso to kill whomever the Godfather decides.
With multiple Mafioso an Escort can not consistently stop Mafia kills.