  We investigate multilepton signatures, arising from the decays of doubly
charged and singly charged Higgs bosons in the Type-II Seesaw model. Depending
on the vacuum expectation value of the triplet $v_{\Delta}$, the doubly and
singly charged Higgs bosons can decay into a large variety of multi-lepton
final states. We explore all possible decay modes corresponding to different
regimes of $v_{\Delta}$, that generate distinguishing four and five leptonic
signatures. We focus on the 13 TeV Large Hadron Collider (LHC) and further
extend the study to a very high energy proton-proton collider (VLHC) with a
center-of-mass energy of 100 TeV. We find that a doubly charged Higgs boson of
masses around 375 GeV can be discovered at immediate LHC runs. A heavier mass
of 630 GeV can instead be discovered at the high-luminosity run of the LHC or
at the VLHC with 30 $\rm{fb}^{-1}$.
