  We report the identification of 89 new systems containing ultracool dwarf
companions to main sequence stars and white dwarfs, using the citizen science
project Backyard Worlds: Planet 9 and cross-reference between Gaia and
CatWISE2020. Thirty-two of these companions and thirty-three host stars were
followed up with spectroscopic observations, with companion spectral types
ranging from M7-T9 and host spectral types ranging from G2-M9. These systems
exhibit diverse characteristics, from young to old ages, blue to very red
spectral morphologies, potential membership to known young moving groups, and
evidence of spectral binarity in 9 companions. Twenty of the host stars in our
sample show evidence for higher order multiplicity, with an additional 11 host
stars being resolved binaries themselves. We compare this sample's
characteristics with those of the known stellar binary and exoplanet
populations, and find our sample begins to fill in the gap between directly
imaged exoplanets and stellary binaries on mass ratio-binding energy plots.
With this study, we increase the population of ultracool dwarf companions to
FGK stars by $\sim$42\%, and more than triple the known population of ultracool
dwarf companions with separations larger than 1,000 au, providing excellent
targets for future atmospheric retrievals.
