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During the early developmental stages of Duel Links, a Duelist's brain power coincided with a monster's power. So when the Plana - who had mental abilities that far exceeded those of normal people - infiltrated Duel Links, they quickly overwhelmed everyone. Even to this day, they repeatedly attack to disrupt the Duel Links system.
When starting a Duel with Seto Kaiba (DSOD), the Unknown Duelist says "What you are doing is dangerous.", followed by "I can't warn you enough, Kaiba."
When she wins the Duel, she says "You will never become the Pharaoh."
When she loses the Duel, she says either "I tried to stop you from making a grave mistake." or "Sigh... I liked the style of this avatar."
When the Unknown Duelist Summons "Duza the Meteor Cubic Vessel", a cut-in frame of the Unknown Duelist's face briefly appears, and she announces "Duza the Meteor Cubic Vessel!"
Most of the time when the Unknown Duelist attacks with that monster, she announces "Duza the Meteor Cubic Vessel attacks!", followed by "Boost Knuckle!"
When the Unknown Duelist activates either of that monster's effects, she announces "Duza the Meteor Cubic Vessel's effect activates!"
Spells/Traps
When the Unknown Duelist activates "Cubic Wave", she announces "I activate the Spell Card, Cubic Wave!"
When the Unknown Duelist activates that card's effect, she announces "I banish Cubic Wave and Cubic monsters from my Graveyard!", followed by "For each Cubic I banish, your monster is neutralized!"
When the Unknown Duelist activates "Cubic Mandala", she announces "I activate the Continuous Trap, Cubic Mandala!", followed by "Your monsters may revive, but they're neutralized!"
Sera's avatar disappearing after losing in "TRANSCEND GAME"
Unknown Duelist's loss artwork in Duel Links
The Unknown Duelist's loss artwork is based on the manga panel from "TRANSCEND GAME (part 2)", when Sera's avatar "Prana" disappears after losing to Seto Kaiba.
The Unknown Duelist is the only character in Yu-Gi-Oh! Duel Links who has appeared in the manga but not any anime. However, her alter-ego, Sera, appeared in the movie The Dark Side of Dimensions.
