  We construct families, and concrete examples, of simple extensions of the
Standard Model that can yield ultralight {real or} complex vectors or scalars
with potential astrophysical relevance. Specifically, the mass range for these
putative fundamental bosons ($\sim 10^{-10}-10^{-20}$ eV) would lead
dynamically to both new non-black hole compact objects (bosonic stars) and new
non-Kerr black holes, with masses of $\sim M_\odot$ to $\sim 10^{10} M_\odot$,
corresponding to the mass range of astrophysical black hole candidates (from
stellar mass to supermassive). For each model, we study the properties of the
mass spectrum and interactions after spontaneous symmetry breaking, discuss its
theoretical viability and caveats, as well as some of its potential and most
relevant phenomenological implications {linking them to the} physics of compact
objects.
