Darlingverse/Elara
Why Elara Made an Impression
Internal Arcane Resonance & Repair: Papa's goal was to animate the flesh golem, not just assemble it. This required a complex magical process. Elara, as an arcane scholar, possessed the most refined understanding of magic among the children. While others provided "parts," Elara's essence provided the arcane blueprint or matrix that allowed Darling's composite mind to function and eventually, to grow.
The First Coherent Voice: Perhaps Elara was the first personality (or one of the very first) to achieve a degree of internal coherence or self-awareness within the chaotic golem mind. Her inherent drive to "unravel complex magical theories" might have led her to instinctively apply her knowledge to the very fabric of Darling's emergent consciousness. She didn't just exist within Darling; she was actively trying to understand and perhaps stabilize Darling's nascent magical abilities from within.
A "Shield" of Knowledge: The "mental block shield" you mentioned for Elara can be linked to this. When Darling first started manifesting magical abilities (perhaps instinctively, before the player knew they were Wizard levels), Elara's subconscious mind, sensing the external magical influence of Barovia and Darling's growing awareness, instinctively projected her arcane knowledge outward as a protective layer, trying to make sense of the chaotic magical energies. This projection manifested as Darling gaining access to basic wizardry, but at the cost of Elara's full personal memory being momentarily suppressed by the sheer effort or trauma of this internal "integration." She essentially became the conduit for Darling's innate magical potential, a role she continues to play as the "magic tech expert."
This makes Elara's impact unique and essential to Darling's very foundation, justifying those specific Wizard levels.