King MacFrights is the sixth boss encountered in Luigi's Mansion 3. King MacFrights is encountered and fought on the sixth floor after Luigi locates him at Castle MacFrights. He then taunts Luigi with the elevator button to the seventh floor and challenges him to make it through his castle and reach him.
King MacFrights is a medieval ghost with an appearance similar to a king. He has a red beard, gloves, and hair that has a large bald spot and a gold crown with rubies on top of his head, as well as yellow eyes and a mouth.
Luigi searches the jousting area when King MacFrights notices him on a balcony. Enraged at his presence, he then possesses a suit of armor attached to a steed, and then, upon showboating the "audience", charges at Luigi, forcing the latter to dodge.