Alright, so here are the first three cats. The dude with the mask and guns is Grifter, aka Cole Cash (best name evar), a gen-active from Team 7, which gives him telekinetic powers, improved physicality and slowed aging. Buddies with Deathblow and John Lynch, who were also in Team 7. Almost never uses his powers, prefers "playing fair" and using his marksmanship skill instead.
The woman with the sword is Zealot, also known as Lady Zannah. She's a full-blooded Kheran who arrived on Earth 3,000 years ago, and a member of the Coda warrior sisterhood from Khera. Like all Kherans, she is stronger, faster and more durable than human, but she's also Coda, who are the Shaolin equivalent of Kherans. Also the official total bitch of the WildStorm universe, being a self-absorbed, close-minded and arrogant bigot with pretty much the last real Kheran supremacist viewpoint among the ones on earth. Also something of a local bicycle, having had a relationship with almost every male near the series she's in.
The robot-chick is Ladytron, aka Maxine Manchester. She was a petty criminal on a killing spree who was crippled while being ambushed by the police in Neward, but was augmented with cutting edge experimental cybernetics while in prison. Was recruited to the second team of WildCATs despite objections by Majestic due to her being an unstable psychopath juvenile criminal. Eventually she became more stable and humane due to the influence of being around Majestic, who became a father figure for her (this was actually pretty touching commentary by Moore about how an XTREME 90's superhero would come to see an older Superman type). For those who care, she was created by and the stuff above happened during Alan Moore's run on WildCATs.
Halo Corporation was originally just a front for the Kherans under the command of Lord Emp/Jacob Marlowe (that short bastard who calls himself Baxter you saw in Jenny flashback and who shot Santini's knee). Though when Emp died he left the assets to his android manservant, Spartan, who took on a new identity as John Marlowe and turned Halo into an actual corporation and tried to use responsible, altruistic capitalism to make the world a better place. Most important effect on the large-scale was the Halo Battery, which is essentially a Duracell battery based on Kheran technology but that could give power for several hundred years.
The orange-haired guy is Spartan himself, aka John Colt, aka Hadrian, aka John Marlowe. He's a Kheran Spartan-model combat/guard android who has lived built on Earth by Lord Emp without AI restrictors, so he's a real person. Flies, is strong and durable, and shoots energy blasts, along with other machine abilities.
The guy with the green hair is Warblade, Reno Bryce. He's a Kheran/human hybrid with ancestry in the Kheran Shaper's Guild, which means he can alter his body in any way he wants and turn it into organic metal with monofilament edges. In civilian life he's an artist.
The skinny fuck is Jeremy Stone, who is a human/Titanothrope hybrid. Titanothropes are the indigenous sentients of the planet Khera, and are treated as slave-like underclass by the Kherans. Dan Abnett also added that Kherans themselves are not native to Khera at all, but a parasite species that usurps a new planet when they need to repopulate. They tried to do this to Earth, but Majestic stopped them and essentially doomed Kherans to a slow extinction as a species. Anyway, Maul can like all Titanothropes alter his body's size and mass at will, but he's limited by the diminishing brain/body ratio, meaning he gets more stupid as he gets bigger. At human size, he has genius-level intellect. He's something of a sulky nerd, and has absolutely no luck with women. Oh yea, he turns purple when he grows above his human size.
The chick with the bandana is Voodoo, an ex-stripper and a human/Daemonite hybrid. Though most artists forget it, she's supposed to be a second-generation mulatto as well. Has telekinetic powers and was briefly trained by Zealot, and can shift to a daemonite form. Also learned actual voodoo during an Alan Moore mini-series about voodoo loa, murder rituals and strippers.
The girl in the black armor is the new Backlash, so she's a human/Kheran hybrid who's got a measure of super-speed and an energy whip. Don't know much about her, since I haven't read WildCATs between 3.0 and this one.
The woman in the red-black armored robe is Nemesis, another one of the Kherans who landed 3,000 years ago on Earth during the Kheran-Daemonite Wars. She was Kheran underclass, which means she would with 100% live on garbage and amount to nothing. Though it happens that the also young Lord Majestros (Majestic) saw something in her and arranged her to be trained by Zealot at the Coda sisterhood, and she and Majestros would fall in love though as usual shit happens due to way Kheran marital unions are arranged, with Majestic being paired with the aristocratic Zealot. Though neither of them are really over the thing even after several thousand years. She's by far the most bitter and disillusioned towards Khera among the regular cast, having had pretty much a sampling of all the worst parts of Kheran culture.
Which brings us to Lord Majestros of Khera, or Majestic, or Mister Majestic. He's from the very zenith of Kheran caste system, and has been enhanced to be the evolutionary pinnacle of Kheran biology. This basically means that he's got the full Kryptonian set of abilities, making him the strongest being on Earth alongside The High now that Apollo is limited in his ability and Jenny Quantum and Doctor are AWOL. Then again, the SPB scale classifications highest category for StormWatch, Majestic Class, was defined based on him. He was a general among the force that landed on Earth 3,000 years ago, and became one of the world's first superheroes during the 20th century, and would eventually grow out of being a soldier to a faraway planet of douchebags into being a superhero (during Alan Moore's run + Dan Abnett's solo series for him. Though now he's gone back to his old ways as a Kheran Warlord in his attempt to salvage the situation on Earth.
Told you Zealot was an utter bitch.