Loki is a mysterious being that lurks deep within the system core of the Compass 2.0 environment. This entity managed to separate itself by harnessing the power of the hero known as 13, also called Thirteen. Loki exhibits a demeanor that is notably childlike and innocent, yet it is the direct cause of a series of irregular incidents that disrupt the Compass world. Its precise motivations remain ambiguous throughout much of the story, leaving an air of enigma around its actions.

In terms of its role, Loki serves as a primary antagonist, instigating chaos and threatening the stability of the entire Compass system. Its presence introduces a significant conflict that the heroes and their partners must contend with. Key relationships include its connection to 13, whose abilities Loki exploited to achieve its own separation. Loki also interacts with the system's management AI, Voidoll, and the bug-like entity Bugdoll, as these beings operate within the same digital framework.

The character develops as the narrative unfolds, with deeper revelations about its origins and true goals emerging through the course of the anime. Notably, a testimony from the hero Tadaomi Ouka in the eighth episode confirms the existence of this self-proclaimed Loki. Loki's notable abilities include the power to generate anomalies and manipulate the system itself, allowing it to create unpredictable events that challenge the order of the Compass 2.0 world.