The production and decay of a heavy charged Higgs boson via process at the Large Hadron Collider (LHC) can be proved by exploiting the chiral structure of the vertex. Two popular realisations of a 2-Higgs Double Model (2HDM-I and 2HDMY), embedding a charged Higgs boson, can be distinguished: their different chiral structures trigger opposite spin states of the top quark which is then transmitted to its decay products. A fit strategy using the morphing technique, by means of sensitive observables, is capable to extract the characteristics of such a charged Higgs boson state in data recorded by the ATLAS experiment at the Large Hadron Collider (LHC).