The narrator of 'My Sister the Serial Killer' is Korede, a hospital nurse who finds herself in the impossible position of cleaning up after her younger sister Ayoola's murders. What makes Korede's perspective so gripping is how ordinary she seems on the surface - she follows routines, worries about work, and crushes on a doctor colleague. But beneath that normalcy simmers this constant tension of knowing her sister's monstrous secret. Korede's voice is dry, darkly funny at times, and deeply conflicted - she loves Ayoola fiercely but also resents her, fears her, and feels trapped by their twisted bond.
The brilliance of having Korede narrate lies in how it forces readers into complicity. We see every bloodstain through her practical, medical-trained eyes, every cover-up through her exhausted resignation. Her narration exposes the absurdity of Nigerian society's beauty standards too - Ayoola gets away with everything because she's gorgeous, while Korede, the responsible one, remains invisible. The most chilling aspect is how Korede's voice gradually reveals her own disturbing capacity for moral compromise, making us question how different the sisters truly are underneath.