  By scrutinizing the singular sector of the Lounesto spinor classification, we
investigate the correct definition of the expansion coefficient functions of
local fermionic fields within a fully Lorentz covariant theory. As we can
observe, a careful definition of the adjoint structure, directed towards local
fields, maps singular spinors into class-2 according to a general spinor
classification. Furthermore, we investigate all the necessary mathematical
tools for constructing local fermionic and bosonic fields and provide insights
into the physical implications for the other singular classes. Besides, we also
show that incorporating \emph{Wigner degeneracy} maintains the rotational
symmetry formalism working in general.
