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Luke is the only son of a noble family of the Kimlasca Kingdom. Since a kidnapping incident when he was young, he has lived isolated in his father's manor. Because of the shock of being kidnapped, he has lost the memory of his childhood. With his family's wealth, he has all of life's comforts, including training with Van, a soldier and teacher he admires very much. He is terribly selfish and ignorant of what the real world is like, but eventually grows out of this and wishes to become a hero. His only hobby is swordsmanship, and though rough, he is quite skilled. He has the interesting ability to create a "hyperresonance" on his own with the power of the Seventh Fonon, a sort of power that usually requires more than one person.
The reason why Luke has no memories is that he is a replica. A replica has no memories of their original, essentially starting their existence as a blank slate. The "original" Luke is actually Asch. The first time Luke realizes this, he is devastated, but later realizes that this means he can become his own person. Following his part in the fall of Akzeriuth (due to Van's manipulation), Luke is abandoned by his friends because of his selfish, spoiled attitude. Coming to realize his own faults, Luke vows to change and tries to redeem himself for the destruction of Akzeriuth. Though he eventually regains the trust of his comrades, his guilt, and the weight of being a mere replica, continues to weigh on him throughout the adventure.
After defeating Van in the Absorption Gate, Luke begins to suffer from an inferiority complex, believing that with Asch alive, he has no reason to exist. However, when he makes the decision to sacrifice himself (along with 10,000 other replicas) atop the Tower of Rem, Luke finally realizes his own self-worth and will to live, though this seems to come too late, as he learns he is fated to fade away regardless. Luke defeats Asch on Eldrant, settling who will go on to face Van. When Asch is killed by replicated Oracle Knights in Eldrant, his power flows into Luke, allowing Luke to use the power of a second-order hyperresonance. Finally, the party meets Van atop Eldrant and defeats him.
Tearfully saying goodbye to his companions, Luke uses his power and the Key of Lorelei to free Lorelei. Meanwhile, he and Asch seem to merge in a process called "The Big Bang". After the ending credits, a "Luke" emerges from the remains of Eldrant. Though it is never revealed if it is Luke and/or Asch, the individual can be seen carrying the Key of Lorelei on his back in the same manner in which Luke carried his own swords, being accessible by a left-handed person such as himself.
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