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In our two preceding papers we studied bipartite composite boson (orquasiboson) systems through their realization in terms of deformed oscillators.Therein, the entanglement characteristics such as the entanglement entropy andpurity were found and expressed, for both one-quasiboson and more complexstates, through the parameter of deformation. In this work we initiate ananalogous study of composite fermions for two major cases: (i) "boson +fermion" composites; (ii) "deformed-boson + fermion" composites. Both theentanglement entropy and purity of composite fermions are dealt with, theirdependence on the relevant parameters established, and for some particular two-or three-mode cases depicted graphically. In a few special cases theentanglement entropy turns out to be constant $S_0=\ln 2$ (or $\ln 3$) or$S_0=0$, while in the rest of the cases which we considered it varies betweenzero and $\ln 2$ (or $\ln 3$).

Entanglement entropy of composite fermions realized by (deformed) fermions vs. that of composite bosons