1. Visual resemblance

      Driver has long been associated by fans with Snape due to his sharp features, dark hair, prominent nose, and brooding look. Essiedu’s appearance differs significantly from the canonical image (pale skin, long black hair, gaunt build).

2. Age and timeline

      Driver is 42 — close to Snape’s age in the early books (31–38). Essiedu is 34 but looks younger, which may not fit the “weathered” teacher with a dark past.

3. Typecasting and previous roles

      Driver has played complex, morally conflicted characters (Kylo Ren, The Report, Marriage Story) — ideal for Snape, a cynical, tragic figure with a double life. Essiedu is talented, but his most acclaimed roles (e.g., I May Destroy You) have a different tone.

4. Fan casting and expectations

      For years, fans have named Driver as the top choice; he’s become the unofficial fan favorite. For Essiedu, on the other hand, petitions have emerged demanding a recasting due to the perceived mismatch with the book description and widespread dissatisfaction.

5. Canon fidelity and audience attachment

      Snape’s appearance is one of the most visually iconic in the series — pale skin, greasy black hair, a hooked nose. Driver aligns almost perfectly with that description. While inclusive casting is important and can bring fresh dimensions to a role, in this case millions of readers have a deeply ingrained mental image of the character. For many fans, deviating from that specific visual identity makes it harder to connect with the portrayal, regardless of the actor’s talent.