The Manhunters are a fictional race of extraterrestrial robots that appear in titles published by DC Comics.
The Manhunters were the first attempt of the Guardians of the Universe to create an interstellar police force that would combat evil all over the cosmos. Their name and much of their code of behavior was modeled by the Guardians of the Universe on the Manhunters of Ma'aleca'andra (Mars) millions of years ago.
However, a first attempt must have prototypes and this large guy is the prototype manhunter. Like any advanced robot, designs evolve over time. This one is meant to invoke a Guardian like feel as the manhunter's colors are based on the fact that Guardians are Red & Blue.