Heats Flamesman is a small, flame-headed monster encountered in Hotland. Upon first meeting him, he tells the protagonist to his name.

He is later encountered on the third floor to the right of the room before the MTT Resort. Whether the protagonist tells him that they or not, he puts on a flabbergasted expression and remark that he was easily defeated. Speaking to him again after the protagonist tells him that they ed his name earns the response "I'll always that you ed!" Likewise, if the protagonist forgot he responds "I'll never forget that you forgot!" If Mettaton is killed, he becomes absent from there.