MM] Since Fierce Deity Link has no official origin story, my head cannon has always been that it is Link with the Triforce of Power… In a different universe, Link gets Power.
Fierce Deity Mask - The Legend of Zelda: Tears of the Kingdom Guide - IGN
Daily Debate: Could the Fierce Deity Be His Own Character in a Future Zelda Game? - Zelda Dungeon
Overpowered: The Fierce Deity Mask | Zelda Universe
Majora's Mask -- Fierce Deity Link portrait by onisuu on DeviantArt
Majora's Mask should terrify you, and this is why. | With A Terrible Fate