  Basing on a self-consistent method, we predict theoretically that there
occurs not only a normal (quasi) fermion mode, but also a collective fermion
mode, plasmino, in a warm 2D massless Dirac system, especially in a warm
intrinsic graphene system. Results of Landau damping show that both fermion and
plasmino are well defined modes. We find that there are sharp differences
between the discussed system and the QCD/QED system. Firstly, the thermal mass
is proportional to $\alpha_g^{3/4}T$ but not $\alpha_g T$. Secondly, at
$0<q<q_c$, the fermion channel and plasmino channel are nearly degenerate and
furthermore, the energy difference between fermion and plasmino becomes more
and more larger with increasing $q$ at the region $q>q_c$. Thirdly, the fermion
behaves as a "relativity particles" with none zero mass and the plasmino
exhibits an anormal dispersion at moderate momentum.
