Black Gate Keys are required to Duel him at the Gate.
He appears in-game after the player reaches Stage 6 of Duel World (5D's), at which point his Character Unlock Missions become available. Prior to November 24, 2021, he could only be unlocked in the special eventRaid Duel - Fear the Meklord Emperor!. Prior to being made available as a playable character, he appeared as an opponent during the event Primo is here!.
As one of the three Emperors of Iliaster, Primo aimed to rewrite the present to prevent a post-apocalyptic future. That required the complete destruction of New Domino City, which he was more than willing to do with his army of Duel Bots and his powerful "Meklord Emperor Wisel".
When starting a Duel with Yusei Fudo, Primo announces "I'm the one who will strike you down, Yusei Fudo!" or "When I defeat you, I'll snatch your Stardust Dragon!"
When he wins the Duel, Primo says "Synchro is far too great for a pest like you to wield!" followed by "You have failed, just like your Father!" or "Vanish along with the world, Yusei!"
When he loses the Duel, Primo says "Yusei Fudo, I will get my revenge!"
Iliaster
When starting a Duel with Aporia, Paradox, or Z-one, Primo announces "Don't order me around! I do whatever I want!"
When he wins the Duel, Primo says "Hahahaha! Look at that! You lost!"
When he loses the Duel, Primo says "Humph... Fine."
When Primo activates the effect of "Meklord Emperor Wisel" in his hand, he announces "An effect destroyed my monster, so I Special Summon this!" or "I use Meklord Emperor Wisel's effect to Special Summon it!" When Primo summons "Meklord Emperor Wisel" (by any method), a cut-in frame of Primo briefly appears and he announces "Do you feel a dark shadow of doom closing around you? It's the shadow cast by my Meklord Emperor Wisel!" or "Combine into one! Meklord Emperor Wisel!" If "Meklord Emperor Wisel" has not been previously summoned in the current Duel, an animation of "Meklord Emperor Wisel" being summoned plays afterward.
Most of the time when Primo attacks with that monster, he announces "Meklord Emperor Wisel! Attack! Stainless Steel Slash!"
When Primo activates that monster's Ignition Effect, he announces "Meklord Emperor Wisel absorbs your Synchro Monster!" or "Your Synchro Monster will fuel my Meklord's strength! Synchro Absorption!"
When Primo activates that monster's Quick Effect, he announces "Meklord Emperor Wisel negates and destroys your Spell!"
When Primo activates the effect of "Meklord Emperor Wisel - Synchro Absorption" in his hand, he announces "I send a Meklord to the Graveyard to Special Summon this!" When Primo summons "Meklord Emperor Wisel - Synchro Absorption" (by any method), a cut-in frame of Primo briefly appears and he announces "Power up! Meklord Emperor Wisel - Synchro Absorption!"
Most of the time when Primo attacks with that monster, he announces "Meklord Emperor Wisel - Synchro Absorption! Take 'em down! Stainless Steel Slash!"
When Primo activates that monster's Trigger Effect, he announces "By Special Summoning it, one of your monsters can't attack!"
When Primo activates that monster's Quick Effect, he announces "I Tribute this card to negate and destroy that card!"
When Primo activates the effect of "Meklord Emperor Skiel" in his hand, he announces"I use Meklord Emperor Skiel's effect to Special Summon it!" When Primo summons "Meklord Emperor Skiel" (by any method), a cut-in of Primo's face briefly appears and he announces "Lester! I'm borrowing your card! Combine, Meklord Emperor Skiel!"
Most of the time when Primo attacks with that monster, he announces "Meklord Emperor Skiel! Let 'em have it!"
When Primo activates that monster's first Ignition Effect, he announces "Meklord Emperor Skiel! Absorb that Synchro Monster!"
When Primo activates that monster's second ignition Effect, he announces "I send a monster equipped to my Skiel to the Graveyard! It can now attack you directly this turn!"
When Primo activates the effect of "Meklord Emperor Granel" in his hand, he announces "I use Meklord Emperor Granel's effect to Special Summon it!" When Primo summons "Meklord Emperor Granel" (by any method), a cut-in of Primo's face briefly appears and he announces "Jakob's card, give me your power! Combine into Meklord Emperor Granel!"
Most of the time when Primo attacks with that monster, he announces "Attack, Meklord Emperor Granel! Final Bombardment!"
When Primo activates that monster's first Ignition Effect, he announces "Meklord Emperor Granel snatches your Synchro Monster!"
When Primo activates that monster's second Ignition Effect, he announces "Meklord Emperor Granel's effect activates! It Special Summons a monster that's equipped to it!"
When Primo summons "Granel Attack", he announces "Granel Attack!"
Most of the time when Primo attacks with that monster, he announces "Go and get 'em, Granel Attack!"
Spells/Traps
When Primo activates "Meklord Assembly", he announces "I activate the Continuous Spell, Meklord Assembly!"
When Primo activates that card's first effect, he announces "Meklord Assembly's effect activates! I discard a card to destroy one monster on my field!"
When Primo activates that card's second effect, he announces "When a Meklord is destroyed, Meklord Assembly activates! It destroys one face-up Spell or Trap card!"