Lukos is a XENOS and the twin of Krios. As a member of his species, he carries the role of a knight, with his primary duty being the protection of his twin. He is deeply concerned about Krios, who has become involved with humans on Earth. This concern drives much of his perspective and actions, as he watches his sibling navigate relationships and conflicts in an unfamiliar world. His protective nature suggests a strong sense of responsibility and loyalty, qualities that define his interactions with others. In terms of personality, Lukos is frequently recognized as an analytical, curious, and independent individual. He displays the traits of a natural knowledge seeker, drawn to deep thinking and complex problem-solving, which likely aids him in his role as a guardian. Within the story of SI-VIS: The Sound of Heroes, Lukos functions as a supporting character whose presence is closely tied to Krios. The relationship between the twins is central to his role, and his narrative involvement deepens as the twins are confronted with the consequences of Krios’s entanglement with the human world. The episode titled A Diva and a Knight signals a significant focus on the dynamic between Lukos and Krios, likely exploring their bond and the personal challenges Lukos faces as a protector. His development appears to stem from this tension between his duty to safeguard his twin and the need to adapt to the unfamiliar circumstances introduced by human contact. While specific abilities are not detailed in available records, his designation as a knight implies combat prowess and a capacity for defending others, likely tied to the attributes of his XENOS heritage.