Originally motivated for the generation of (Majorana) neutrino masses, the Type 2 Seesaw Model
has also a rich extended Higgs sector with, if accessible at the LHC, a distinctive phenomenology
of neutral, charged and doubly-charged states. The goal of the work is to present an exhaustive
phenomenological study of the most promising production and decay channels of pair or associated
scalars, decaying directly or in cascades to Standard Model particles at the LHC. The study is
complementary to the literature in that it highlights a previously unnoticed important sensitivity to
a mixing angle. The ensuing uncertainty calls for a comprehensive experimental search strategy for
the various processes. These processes can be studied within LHC energies reach, by comparing
cutflow results for different final states. We carried out prospective search analyses with multi-
lepton, jets and missing energy configurations, assuming an ATLAS-like detector at LHC and
HL-LHC, for charged, doubly-charged, and for the first time neutral scalar productions. The
work is a collaboration between ATLAS experimentalists and theoreticians in continuation of
an endeavor that lead to previous published ATLAS analyses for the search of (doubly)charged
Higgs bosons [1, 2], aiming at proposals for future experimental searches. This proceeding only
summarizes some of the results, and the reader is encouraged to consult the extended work [3] for
further detailing the content of each section.