Direct YPS comparisons fail here because we are weighing an authority-based spirit against a physical force of nature. Measuring a YPS-3 against a YPS-6 is an exercise in futility when their abilities operate on fundamentally different axes of existence. Instead, the real metric is how both characters utilize the "eternal child" archetype to mask profound emotional stagnation. Beatrice and Milim both use their status as immortal youths to shield themselves from the trauma of abandonment, turning their power into a psychological barrier. For Beatrice, her arcane knowledge is a wall she built while waiting for "That Person," rendering her a passive observer until Subaru's persistence forces her to choose agency over duty. Milim, conversely, uses her planet-shaking capacity as a distraction. Her search for "fun" is a survival mechanism to avoid the void left by her original family. While Beatrice's growth is a climb from nihilism to vulnerability, Milim's is a regression from a distant god to a companion who can actually feel. Their shared low Ego scores reveal a critical truth about the "child-god" trope: immense power often results in a loss of self-determination. Whether it is Beatrice's reliance on a contractor or Milim's impulsive nature, both are driven by external catalysts rather than internal will. The tragedy of the immortal child is that they are frozen in time until a bond—whether it is the contract with Subaru or the friendship with Rimuru—provides the necessary friction to restart their emotional clock.