  We study extensions of the standard model by one generation of vector-like
leptons with non-standard hypercharges, which allow for a sizable modification
of the h -> gamma gamma decay rate for new lepton masses in the 300 GeV - 1 TeV
range. We analyze vaccum stability implications for different hypercharges.
Effects in h -> Z gamma are typically much smaller than in h -> gamma gamma,
but distinct among the considered hypercharge assignments. Non-standard
hypercharges constrain or entirely forbid possible mixing operators with
standard model leptons. As a consequence, the leading contributions to the
experimentally strongly constrained electric dipole moments of standard model
fermions are only generated at the two loop level by the new CP violating
sources of the considered setups. We derive the bounds from dipole moments,
electro-weak precision observables and lepton flavor violating processes, and
discuss their implications. Finally, we examine the production and decay
channels of the vector-like leptons at the LHC, and find that signatures with
multiple light leptons or taus are already probing interesting regions of
parameter space.
