The intersection of obsession and utility reveals that isekai often treats female devotion as a tool for systemic stability rather than personal growth. A direct YPS comparison fails here because Albedo operates as a YPS-4 authority figure managing geopolitical shifts, whereas Darkness functions as a YPS-2 physical asset meant to absorb damage. Their power operates on different planes: one governs the map, the other holds the line. The true commonality lies in how their specific pathologies serve their respective parties. Albedo’s obsessive love for Ainz is not a romantic subplot but a management tool that ensures the Great Tomb of Nazarick runs with cold efficiency. Conversely, Darkness’s masochism transforms her role as a Crusader into a psychological armor; she does not just tank hits for her friends, she thrives on them. Albedo uses her devotion to erase the autonomy of others, while Darkness uses hers to surrender her own. This distinction proves that in the isekai framework, loyalty is less about a moral bond and more about how a character's internal instability is converted into a functional asset.