  We construct a pseudoclassical particle model associated to the twisted N=2
SUSY algebra in four dimensions. The particle model has four kappa symmetries.
Three of them can be used to reduce the model to the vector supersymmetry
particle case. The quantization of the model gives rise to two copies of the 4d
Dirac equation. The kappa symmetries result to be associated to 4 TSUSY
invariant bilinear odd operators who are null operators when a particular
condition is satisfied. These operators are in correspondence one to one with
analogous operators existing in the case of the N=2 SUSY algebra, making both
cases 1/2 BPS.
