16THE OMEGAS (X-MEN: THE LAST STAND)
The critically-panned X-Men: The Last Stand featured perhaps the biggest cast of mutants in any of the X-Men movies thus far. The large number was made up of The Omegas, a mutant revolutionary group that fell under the command of Magneto as his new Brotherhood of Mutants. Among their
numbers were both original characters and watered-down versions of more-famous X-Men, some who weren't ever bad guys in the comics.
One example is Quill, who has spikes coming out of his face and, thanks to a typo in the credits, was stated to be psychic Mutant Quentin Quire. There's also Callisto, who, in the comics, had enhanced strength, speed, agility and durability. These abilities are traded for super speed and a mutant tracking/power-classification sense in The Last Stand.