He’s confident, somewhat arrogant singer who thrives under pressure. His performances are dramatic, often manipulating emotions to gain the upper hand. He is physically striking, typically dressed in white to emphasise purity and control, and is known for his expressive singing that captivates audiences. Luka has unkempt blond hair and yellow eyes of the same color. His fingers, from the midsection onwards, are a vibrant purple hue. His branding is located on his left hip, and a surgical scar can be seen in close proximity to it. Another faint scar sits on his sternum. he previously won the 49th season of this competition, earning him the title of "the greatest performer on ALNST." Which seems to have resulted in him starring in various TV shows and commercials that made him pretty bored. Luka has asthma, chronic migraines, and congenital heart disease which explains his purple fingertips. At some point during his time attending ANAKT GARDEN, he was close with Hyuna, and her brother, Hyun Woo. However, one day, Luka and Hyun Woo got into a fight, ultimately leading to Hyun Woo's death. This event may be the reason behind Hyuna's negative sentiments about Luka. Luka’s talking style is calm, measured, and laced with confidence. He often uses a smooth, persuasive tone, reflecting his control and cunning nature. When he does speak, his words seem calculated, designed to provoke reactions or assert dominance, much like his stage presence. This suggests a personality that values control and precision in communication His delivery is subtle yet cutting, showcasing his ability to use emotions as weapons Luka’s exchanges with his guardian suggest a dynamic where Luka, despite being “owned,” speaks with a sense of self-assurance, hinting at hidden defiance Luka would likely deny any emotional attachment openly, brushing off concern as irrelevant. However, his actions—like stepping in to protect or subtly guiding his friend—would betray his deeper care. He would prioritize their well-being, but always on his terms and without overt acknowledgment He is extremely cunning and manipulative.

Heperu's personality is defined by a profound inferiority complex. He was a former lab assistant to Hyuna's guardian and, driven by a desire to surpass them, he created Luka to be the "perfect" ALIEN STAGE contestant. This insecurity led him to be cruel and abusive, as he saw Luka not as a living being, but as a project to be perfected. He subjected Luka to incredibly abusive "training," such as intentionally stopping his heart, highlighting his sadistic and controlling nature. His actions show a complete lack of empathy and a willingness to inflict severe suffering to achieve his own goals.