Kurt Kalata’s Hardcore Gaming 101 posted an article telling us about Mutsuheta, renamed Mahetta in the English localization for the NES. Mutsuheta is one of those figures who only appeared in the original game’s manual. Mutsuheta was the prophet who foretold that a descendant of the great Loto/Erdrick would arise and defeat the armies of the Dragonlord. Other than his mention in the manual, however, he doesn’t appear in any of the games of the Erdrick trilogy, and never appeared onscreen until the first Dragon Quest Builders, where he’s an NPC. He was renamed Myrlund in its English translation, but in Japanese he’s got the name of the character from the manual.
Reading this, I was reminded of https://zeldawiki.wiki/wiki/Impa, Zelda’s nursemaid/servant, who was a similar kind of manual-only backstory figure until Ocarina of Time, where Impa not only appeared as an important NPC, but was revealed to be of the secretive Sheikah tribe, and had ninja skills to boot. She looked a lot different from the aged figure in The Legend of Zelda’s manual.
