President Kelly

President Kelly is a villainous alter-ego of Robert Kelly found in the Exiles, while the mainstream Robert Kelly was also an enemy of the X-Men he was never as villainous as many other anti-mutant extremists in Marvel, President Kelly however more than made up for this with his fascist-views on human/mutant relations in which he and an alternate reality General Ross used mass-armies of Sentinels to ruthlessly hunt down and kill almost every mutant on the planet.

This would result in that reality's Magneto engaging in a genocidal plan to strike back, in the end President Kelly and his entire world was utterly wiped out by King Hyperion.