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Growing the supermassive black holes (~10^9 Msun) that power the detectedluminous, highest redshift quasars (z > 6) from light seeds - the remnants ofthe first stars - within ~ 1 Gyr of the Big Bang poses a timing challenge forgrowth models. The formation of massive black hole seeds via direct collapsewith initial masses ~ 10^4 - 10^5 Msun alleviates this problem. Physicalconditions required to form these massive direct collapse black hole (DCBH)seeds are available in the early universe. These viable DCBH formation sites,satellite halos of star-forming galaxies, merge and acquire a stellarcomponent. These produce a new, transient class of objects at high redshift,Obese Black hole Galaxies (OBGs), where the luminosity produced by accretiononto the black hole outshines the stellar component. Therefore, the OBG stageoffers a unique way to discriminate between light and massive initial seeds. Wepredict the multi-wavelength energy output of OBGs and growing Pop III remnantsat a fiducial redshift (z = 9), exploring both standard and slim disk accretiononto the growing central black hole for high and low metallicities of theassociated stellar population. With our computed templates, we derive theselection criteria for OBGs, that comprise a pre-selection that eliminates bluesources; followed by color-color cuts ([F_{070W} - F_{220W}] > 0; -0.3 <[F_{200W} - F_{444W}] < 0.3) and when available, a high ratio of X-ray flux torest-frame optical flux (F_X/F_{444W} >> 1) (Abridged).

Unveiling the first black holes with JWST: multi-wavelength spectral predictions