  In this work we provide a triple master action interpolating among three
self-dual descriptions of massive spin-3/2 particles in $D=2+1$ dimensions.
Such result generalizes a master action previously suggested in the literature.
We also show that, surprisingly a shorthand notation in terms of differential
operators applied in the bosonic cases of spins 2 and 3, can also be defined to
the fermionic case. With the help of projection operators, we have also
obtained the propagator and analyzed unitarity in $D$ dimensions of a second
order spin-3/2 doublet model. Once we demonstrate that this doublet model is
free of ghosts, we provide a master action interpolating such model with a
fourth order theory which has several similarities with the spin-2 linearized
New Massive Gravity theory.
