Grillby is a fire monster, and owner and proprietor of Grillby's. While generally very quiet, he will commend the protagonist for a "good job" during the True Pacifist Ending epilogue. If Papyrus is killed, he will get nervous as Sans is his best costumer and he has not shown up all day. Grillby is either mute or speaks a different language than other monsters. Red Bird tends to speak for him which is revealed at the end of the True Pacifist route and near the end of Genocide route.