  Internal shocks occurring in blazars may accelerate both thermal and
non-thermal electrons. In this paper we examine the consequences that such a
hybrid (thermal/non-thermal) EED has on the spectrum of blazars. Since the
thermal component of the EED may extend to very low energies. We replace the
standard synchrotron process by the more general magneto-bremsstrahlung (MBS).
Significant differences in the energy flux appear at low radio frequencies when
considering MBS instead of the standard synchrotron emission. A drop in the
spectrum appears in the all the radio band and a prominent valley between the
infrared and soft X-rays bands when a hybrid EED is considered, instead of a
power-law EED. In the $\gamma$-ray band an EED of mostly thermal particles
displays significant differences with respect to the one dominated by
non-thermal particles. A thermally-dominated EED produces a synchrotron
self-Compton (SSC) peak extending only up to a few MeV, and the valley
separating the MBS and the SSC peaks is much deeper than if the EED is
dominated by non-thermal particles. The combination of these effects modifies
the Compton dominance of a blazar, suggesting that the vertical scatter in the
distribution of FSRQs and BL Lac objects in the peak synchrotron frequency -
Compton dominance parameter space could be attributed to different proportions
of thermal/non-thermal particles in the EED of blazars. Finally, the
temperature of the electrons in the shocked plasma is shown to be a degenerated
quantity for different magentizations of the ejected material.
