The illusion of the 'devoted partner' archetype hides a fundamental divide between devotion as a psychological crutch and devotion as a strategic catalyst. When placed side by side, these two characters reveal that identical growth trajectories can stem from opposite emotional drivers. Rem’s devotion is a response to a perceived deficiency, a desperate attempt to overwrite her identity as a defective substitute for her sister. Her higher Darkness score manifests in a willingness to endure psychological erasure for the sake of another. Operating at YPS-2, her combat capability remains a tool for service rather than a means of self-assertion. Sylphiette, however, utilizes her affection as a blueprint for self-improvement. She does not seek to replace a lost version of herself but to build a version capable of standing beside her partner. This drive pushes her beyond the boundaries of a standard support role into the YPS-3 tier, where her ability to threaten a city reflects a hard-won agency. The gap in their YPS levels proves that devotion is not a static trait. For one, it is a sanctuary that risks becoming a cage; for the other, it is the engine that drives her from a bullied child to a strategic powerhouse. Their shared low Ego scores are deceptive, masking the difference between a character who disappears into her role and one who masters her role to secure her place in the world.