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Rev. D"],"accepted":{"date-parts":[[2026,2,19]]},"abstract":"<jats:p>Black holes in general relativity exhibit a remarkable feature: their response to static scalar, electromagnetic, and gravitational perturbations\u2014as quantified by the so-called tidal Love numbers\u2014vanishes identically. We present the first exception to this rule: the Love numbers of a black hole perturbed by a fermionic field are nonzero. We derive a closed-form expression of these fermionic Love numbers for generic spin in the background of a Kerr black hole with arbitrary angular momentum. In contrast, we show that the fermionic dissipation numbers vanish for static perturbations, reflecting the absence of superradiance for fermions. 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