No one really knows the pre-inflationary particle dynamics, we simply do not have a complete theory of GUT. However at extremely high temperatures in GUT the quarks, leptons and fermions are in thermal equilibrium with one another. This is true even in the SuSy models and SO(10) models During the Grand Unification Epoch, physical characteristics such as mass, charge, flavor and color charge were meaningless. (key note the period here is also often described as a quark gluon plasma, although the makeup is SuSy particles). We still do not understand the particle physics at this stage, so the answer depends on SuSy or SO(10). I haven't studied the non Susy SO(10) GUT to know how this one works.
the particles of Susy have not yet been observed, so we cannot say with certainty
Then inflation occurs, The rapid expansion of spacetime meant that elementary particles remaining from the Grand Unification Epoch were now distributed very thinly across the Universe. However, the huge potential energy of the inflation field was released at the end of the Inflationary Epoch, repopulating the universe with a dense, hot mixture of quarks, anti-quarks and gluons as it entered the Electroweak Epoch.
The key thing to remember in GUT, is that its not so much that elementary particles are created, its that they drop out of equilibrium or become distinquishable (decouple, freeze out).
Electrons are present however they freezeout after the quark gluons start to form hadrons.
this is from wiki "In particle physics, supersymmetry (SUSY) is a proposed extension of spacetime symmetry that relates two basic classes of elementary particles: bosons, which have an integer-valued spin, and fermions, which have a half-integer spin.[1] Each particle from one group is associated with a particle from the other, called its superpartner, whose spin differs by a half-integer. In a theory with perfectly unbroken supersymmetry, each pair of superpartners shares the same mass and internal quantum numbers besides spin - for example, a "selectron" (superpartner electron) would be a boson version of the electron, and would have the same mass energy and thus be equally easy to find in the lab."
http://en.wikipedia.org/wiki/Supersymmetry
however as noted no super symmetry particles have been observed.
SUSY is SU(5)* SU(3)*SU(2)*U(1) the SM group is SU(3)*SU(2)*U(1) so all your standard model particles become super symmetric particles on the Susy scale.
sticking to the standard model however here is a break down
http://www.nicadd.niu.edu/~bterzic/PHYS652/Lecture_13.pdf
hope this helps
edit forgot to note one other key problem
"In particle physics, an elementary particle or fundamental particle is a particle whose substructure is unknown, thus it is unknown whether it is composed of other particles.[1] Known elementary particles include the fundamental fermions (quarks, leptons, antiquarks, and antileptons), which generally are "matter particles" and "antimatter particles", as well as the fundamental bosons (gauge bosons and Higgs boson), which generally are "force particles" that mediate interactions among fermions.[1] A particle containing two or more elementary particles is a composite particle."
http://en.wikipedia.org/wiki/Elementary_particle
S0(10)*SU(5)*SU(3)*SU(1)*U(1), the SU(10) portion is esentially the Higg's sector, however it requires Higg's bosons of mass values we have not yet observed. Such as 54 Higg's 78 higg's 45 higg's, 154 higg's. There are numerous Higg's field variations and we so far have only observed the 126 Higg's with certainty. So the S0(10) group is uncertain at this time. However it essentially is involved on when particles first gain mass. The Higg's sector has a seesaw mechanism so does SO(10) There is numerous SuSY(10) and non SUSY (10) models and variations here is a review of them
http://pdg.lbl.gov/2013/reviews/rpp2013-rev-higgs-boson.pdf
