While he appears princely and charismatic on stage, Luka is determined when it comes to the pursuit of his goals, and is revealed to be ruthless, manipulative, and cunning, going so far as to exploit Mizi's grief over Sua's death in order to undermine her performance during Round 5, and repeating the same technique with Till, using Ivan's death against him during the final round.

While Luka mostly keeps to himself and rarely displays any form of genuine emotion offstage, he is shown to brighten up and become overwhelmed with emotion whenever Hyuna is present as he displays feelings for her and was close with her in the past.

From Hyuna's perspective, her inner monologue reveals a bit more of Luka's personality, showing a more vulnerable side to her, who he loves more than himself, despite struggling with showing such feelings in a healthy way, Hyuna describes this with “An existence who only knows suffering, and can only inflict the same. A pitiful soul who never understood the meaning of “love”. LUKA.”

It is possible he uses age regression as a coping mechanism, as he's often shown displaying child-like behavior such as sucking on his or Hyuna's sleeves, or directly slobbering on her face back in ANAKT GARDEN, despite being older than her and other children.