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Abstract: We investigate the interplay between physics beyond the Standard Model and modified spacetime geometries in shaping the photon and neutrino spectra from evaporating black holes. We implement three representative supersymmetric (SuSy) benchmarks and a composite dynamics (CoDy) scenario in BlackHawk. We consider both Schwarzschild black holes and regular black holes geometries, namely polymerized, Hayward, and Simpson--Visser black holes. New degrees of freedom at the TeV scale become accessible at Hawking temperatures corresponding to black hole masses of approximately $M_{\rm BH}\sim 10^{10}\,\mathrm{g}$. We show that physics beyond the Standard Model produces distinctive signatures in both the instantaneous secondary-photon and neutrino spectra. Radiative decays generate narrow spectral features with approximately temperature-independent relative amplitudes, while multistep decay cascades produce broad enhancements that become increasingly pronounced at higher temperatures. In contrast, compressed mass spectra exhibit no localized features. Crucially, we show that the effects of new particle physics and modified spacetime geometries can become intertwined in specific energy regimes, altering the resulting spectral signatures. Our results demonstrate that photon and neutrino spectra provide complementary probes of new particle physics and black hole geometry, with predicted spectral enhancements extending into the energy ranges accessible to current and future high-energy observatories.