Since no one has made a Guardian yet, here's an example. Antagonist style.
Name: Brac Saiko
Concept: Cytek's most brutal Surger hunter.
Appearance: Brac isn't tall, but he is big. He has broad shoulders and big muscles. Big enough that he must either work either have a religious approach to working out or be 'on' something. Especially his hands are almost abnormally big, and he makes an intimidating fist. Further, his body is of a darker, messy complexion, and he has several scars on his body of various kinds. Burns, cuts, and some which the source of which is hard to identify. The most noticeable scar runs from the right side of his face to his chin and looks like the imprint made by an ice cream scoop, wide rifts of brown wound tissue.
His eyes are a darkgreen and has short, army-cut blonde hair, except for a single, long lock of hair going down in front of his face. He also has some rather big, dumbo like ears sticking out of his head, but it'd be unwise to draw attention to them.
And then there's his left arm. It's obviously cybernetic, black, polished metal going up to his shoulder, and it's more volumous than his already big right arm. It's shaped much like a real arm, five digits and all, but it has lots of details, pointy bits, whole and put together surfaces, revealing it's transformable nature.
His work and combat uniform consist of a thick armor, black, same style as his cybernetic arm, which covers his chest, shoulders and lower legs. The right shoulder is asymmetrically big and round in shapes and connected to his arm via three, thick, plated power cables. He wears a biker-like helmet with a head-up display. A dark blue, skintight covers all unarmored areas.
In civil, he wears a shifting, urban-camoflage west with the sleeves torn off and a cargo pants with legs in three parts and colors, held together by stylized, big, flat steel chains.
Trait 5: Might makes Right!
Those that fight for their rights are entitled to them. If they win that fight, of course. Brac believes people have to fight for every thing they want in life, and if they don't fight hard enough to get it, that's their fault. For instance, those Surgers have an unique power. They can do things ordinary people can't dream of. Yet, Cytek have been successful at holding them down. Obviously, they don't deserve those rights they pine about so, if they can't even manage to claim them themselves.
Brac often talk about this philosophy, and while it's unknown if he really believes in it or if it's just a foil to justify his sociopathic behavior, most assume the latter.
Trait 4: Multi-Weapon Fighting
Brac's arm can transform into a wide variety of weapons, the default of which is a bayoneted assault gun. Other forms include an extendable spear, a thin shield and a rotating set of blades. The full amount of configurations is known only to Brac and the designer. He also carries a large, two handed hammer with a kinetic booster, that allows to swing it faster than with raw muscle power, in case he needs something with more power than his arm can manage. He rapidly changes style during to throw off his opponent.
Trait 3: Practical
Brac is no techno-wizard, but he knows the basics. He repairs and maintains his own equipment, and he's good with simple tools. He'd probably be a handyman if he hadn't joined the military.
Trait 1: Rage
Brac isn't without humor and he laughs at little men's attempt at provoke him. However, he does have hotbuttons, and flies into a completely rage should they be pressed sufficiently. This primal side of his is even more scary than his normal, but he is very prone to making mistakes and being duped in this form and doing things he might regret later.
Extra Trait: 4, Surger Hunter
The official title of Brac is Master Guardian, but he's at better at fighting against Surgers than with them. Unofficially, he's known as the Surger Hunter, and is quite notorious for it. Most renegade Surgers know about him, and there's plenty of grudges. Brac is experienced in fighting Surgers and has the equipment to do so. He's never thrown off by their effects, is quick to analyze their workings and immediately interrupts rituals.
Brac is a loud and brash sort. He's often in a good mood, constantly cracking jokes, which people tend to laugh at, even if they don't appreciate his rough humor. He's a real alpha-dog and his very aura and confidence means he only rarely has to beat this fact into his henchmen and the random drunks he often encounter in his off-work bar hopping. He still lays down such beatdowns happily, and it's an open secret that Brac has a vicious, sadistic side.
Nonetheless, he's a professional, and very dedicated to his job. Inside Cytek and among his bosses, he acts like the perfect soldier, loyal and disciplined.
A little known fact about Brac is that he was born in the underground. He did a lot of street fighting for money as well as lots of other kinds of crime. When he was caught and facing a life time, Cytek recognized his talent and gave him an offer he couldn't refuse. He quickly excelled within the military and found a new path in life, whether it's better or worse.