The Invincible show is mostly faithful to the comics. It keeps the main plot points intact while making some minor tweaks here and there for visual and narrative purposes. Fans have had mixed reactions to the differences, but it still manages to bring the comic world to life on the screen.
It varies a bit. Some storylines and character developments are slightly different, but it still captures the core essence of the comics.
Overall, the Invincible show stays relatively close to the comics. There are a few changes made to adapt it for the screen, but they don't stray too far from the original source. Some characters might have slightly different arcs or the pacing might be adjusted for better viewing.