  Superradiance provides a unique opportunity for investigating dark sectors as
well as primordial black holes (PBHs), which themselves are candidates for dark
matter (DM) over a wide mass range. Using axion-like particles (ALPs) as an
example, we show that line signals emerging from a superradiated ALP cloud
combined with Hawking radiation from PBHs in extragalactic and galactic halos,
along with microlensing observations lead to complementary constraints on
parameter space combinations including the ALP-photon coupling, ALP mass, PBH
mass, and PBH DM fraction, $f_{\rm PBH}$. For the PBH asteroid mass range
$\sim10^{16}-10^{22}~{\rm g}$, where PBHs can provide the totality of DM, we
demonstrate that ongoing and upcoming observations such as SXI, JWST, and
AMEGO-X will be sensitive to possible line and continuum signals, respectively,
providing probes of previously inaccessible regions of $f_{\rm PBH}$ parameter
space. Further complementarity from a stochastic gravitational-wave background
emerging from the PBH formation mechanism is also considered.
