Henry Cavill as Spartan
Possessed with a cybernetic body, Superstrength, invisibility, energy projection (blasts and shields), flight, enhanced senses. His body even repairs itself.
Elisha Cuthbert as Zealot
Possesses superhuman strength, stamina, durability and longevity, and centuries of combat experience. Limited knowledge of dark sorceries.
Paul Walker as Grifter
Grifter is an incredibly adept fighter, expert in hand-to-hand combat and with most weapons. He is especially good with guns. He also possesses powerful psi powers, though most of the time these are dormant, largely by choice.
Ray Park as Maul
Maul has the ability to grow in mass and strength at will, however as he grows his intelligence decreases proportionately. He can also increase his intelligence by decreasing in size, but this is highly strenuous.
Viggo Mortensen as Warblade
Warblade can alter his molecular structure, allowing him to reshape parts of his body at will, simultaneously turning those parts into a kind of organic steel.
Jessica Szohr as Voodoo
Abilities include telepathy, power beam made of complete telepathic energy converted into force, the Sight which allows her to recognize Daemonite-possessed humans, time-manipulation, regeneration, can shapeshift into a beast-like form, Voodoo magic, and control over magnetic fields.
Melissa George as Void
Void's primary power is teleportation; she can teleport herself and numerous additional persons to any location on the planet. She is also shown to manipulate energy and grow in size (though she used this last power only once). Most importantly, Void can see fragments of the future and was thus instrumental in guiding the WildC.A.T.S. A downside to her powers was that she was cold and distant, though she had emotions.
Chris Bauer as Lord Emp
Emp is virtually immortal, like most Kherubim. He has some degree of superhuman strength (in spite of his small stature). He is also extremely durable, able to endure inordinate amounts of damage.