  The observed dark matter relic abundance may be explained by different
mechanisms, such as thermal freeze-out/freeze-in, with one or more
symmetric/asymmetric components. In this work we investigate the role played by
asymmetries in determining the yield and nature of dark matter in non-minimal
scenarios with more than one dark matter particle. In particular, we show that
the energy density of a particle may come from an asymmetry, even if the
particle is asymptotically symmetric by nature. To illustrate the different
effects of asymmetries, we adopt a model with two dark matter components. We
embed it in a multi-component cogenesis scenario that is also able to reproduce
neutrino masses and the baryon asymmetry. In some cases, the model predicts an
interesting monochromatic neutrino line that may be searched for at neutrino
telescopes.
