We study extensions of the Standard Model (SM) in which copies of the SM scalar SU(2) doublet
are added to the Higgs sector. These scalar doublets either acquire a Vacuum Expectation Value
(VEV) and hence are active or do not develop a VEV and are inert. We consider CP-violation
(CPV) in both the active and inert sector. As an example of a model with CPV in the active
sector, we present a Type-I 2-Higgs-Doublet Model (2HDM) with two active doublets and show
Large Hadron Collider (LHC) signals of such a scenario. The amount of CPV in this case is very
limited due to constraints coming from Electric Dipole Moment experiments. Moreover, 2HDMs
with only active doublets do not provide a Dark Matter (DM) candidate. As a result, we turn to
3-Higgs-Doublet Models (3HDMs) where unbounded CPV and viable DM candidates could be
introduced simultaneously in the inert sector. We investigate DM phenomenology of such models.