  Many new physics scenarios beyond the Standard Model (BSM) necessitate the
existence of new neutral and/or charged scalar fields, which might couple to
the SM charged leptons (but not hadrons), and thus, can give rise to BSM
signals while evading strong constraints mostly coming from the hadronic
sector. I show that future lepton colliders provide a clean environment to
probe these leptophilic new scalars via multi-lepton final states, including
some interesting lepton flavor violating (LFV) channels. I also study the
kinematic distributions of the final state leptons to distinguish the BSM
contributions from neutral and doubly-charged scalars giving rise to the same
final state, as well as from the irreducible SM background.
