  This study delves into the intricate kinematic behavior of ionized gas within
IZw18, a galaxy known for its remarkably low metallicity and proximity.
Leveraging data from MEGARA/GTC, we meticulously analyzed the galaxy's
structure and dynamics using H{\alpha} line profiles. Employing single and
double Gaussian component fittings, we generated detailed maps of luminosity,
velocity, and velocity dispersion across both the main body (MB) and Halo
regions. By extracting integrated spectra from various galactic zones, we
enhanced the signal-to-noise (S/N) ratio. In the MB, a clear rotational pattern
emerged, supplemented by a more intricate kinematic structure from the
double-component fitting, notably featuring a broad component with a FWHM
nearing 2000 km/s. This broad component, exhibiting wide spatial extension,
hints at a high-energy outflow and suggests non-localized sources of
significant kinetic energy. The considerable velocity disparities between
narrow and broad components imply potential spatial segregation, possibly due
to dense gas near the kinematic origin acting as a momentum-reflection 'wall'.
Examining the halos, the NE Halo appears tranquil with low velocity
dispersions, while the SW Halo displays higher velocities and complex
kinematics, indicative of varied dynamic interactions. The presence of the
broad component throughout the MB and the intricate kinematics across all
regions suggests widespread and subtle turbulent motion. This nuanced
understanding of IZw18's kinematic behavior, elucidating the interplay of gas
components and internal structures, enriches our comprehension of dynamics in
blue compact dwarf galaxies. It holds promise for shedding light on early
galaxy formation and the complex kinematics inherent to such environments.
