Drunks

They sing beautifully. But it's worth diversifying them. As people have already suggested, we all know how drunk people can behave and how many comical situations they can have, and this can be implemented in the game:
They can fall asleep. (how they can wake up again to order something or leave)
To get into a fight. (not only among themselves, but also to attack the player, and we would drive them out with a mop and they would run away funny covering their heads with their hands)
Forget to pay. (we already have too much money)
Flirting with the bartender (the gambler)
Start dancing to the music. (to the songs or music of the slot machine)