If you'll accept a few more Thunder-themed characters from a couple of GURPS Supers books I have...
Electra: Christine Chalmers discovered her latent metahuman ability to manipulate electricity when she tried to break off with her then-lover, accidentally electrocuting him when he reacted violently. More surprised then horrified, she hid her powers and began exploring the full extent of her abilities, even as she was completing her studies in Law. She then began a double life as an Assistant District Attorney in her small town of Montpelier by day, and as superheroine Electric Girl by night.
This double life came to an end when a reporter began putting together the evidence of Christine's double-life, and confronted her with the information, just as she was preparing to run for District Attorney herself. She responded by pushing him off a building. Unfortunately for her, he'd left letters to be opened in case of his death. None contained information that could prove Christine was Electric Girl, but the damage to her reputation (and her refusal to undergo telepathic interrogation wasn't helping) caused her to lose the election.
Enraged against the U.S. political system for this defeat, she quit her job, moved to Los Dios and adopted a new identity as Electra, with a costume resembling a power suit to keep people from connecting her to Electric Girl. She's since gathered a team of supervillains known as the New Deadly Dozen (consisting only of 6 villains so far, but the name is intended to confuse investigators), which she leads.
She was one of the villains interested in stealing the name and power of Captain Thunder, and was only saved from the lethal draining of Zzzax by the timely intervention of her lover, the psionic Professor Possessor. She's currently hospitalized and recovering in the Deadly Dozen's hidden H.Q.
Scrambler: Joseph Lawrence grew up in the Dallas-Fort Worth area, where an aptitude for electronics got him a job working in a high-tech firm producing satellite components for NASA. Unfortunately, when his innate metahuman ability to generate a dampening field preventing electrical activity began manifesting themselves, strange incidents with power surges and failing electronics cost him his job, and nearly cost him his sanity, as he became convinced he was the victim of a strange conspiracy. It was finally when he was alone in his appartment that his powers finally kicked in at full strength, turning him into an electrical syphon.
At first he tried to suppress his power, but turning it off for more then a brief time became too tired, and he turned to drugs to give him the energy to shut the field off. As these problems made it impossible for him to get a new job in the electronics industry, Joe turned to crime, at first targeting the companies that had fired or refused to hire him. After stumbling upon and successfully raiding a hidden Foundry Installation, he realized he could become a true supervillain. He called himself Scrambler and made an armored costume out of a blue scuba suit with a white "S" pattern at belt, gloves, boots and mask.
His presence during the Battle of Zzzax was actually an accident, as he was robbing a nearby electronics firm when two of the electrical combatants crashed into the building. He somehow got involved in the scuffle, and discovered that he could drain the powers from electrical supers, and that in doing so he could turn off his dampening powers without effort. Scrambler is now convinced that if he can drain more power out of electrical supers, he can live normally again. And what better way to test this theory then with the world's most powerful electrical supers?
Voltmaster: The man currently known as Victor Scholmann was born in the first century B.C., and was then called Vercingetorix. While he was leading the scattered Gaul tribes against the Roman invaders, a desperate prayer to his storm god got him struck by lightning. After regaining consciousness, he discovered his hands crackled with lightning of their own, sign of divine favor. Unfortunately, he couldn't actually project lightning, and even if he could've, one man could not stop the march of the Roman Army.
As the years went on, he discovered the other side of his divine gifts: he did not grow old. Patiently, he visited all the sights the world offered him: Byzantium, Egypt, Rome, Athens, Persia... He quickly came across other immortals such as Daedalus and Taurus, and eventually gathered his own considerable wealth and resources, going from a pawn to a player in the shadowy world of ancient conspiracies, as well as mastering mathematics, sciences and medical arts, becoming an expert in countless scientific fields.
After living 2000 years, Victor (as he now called himself) had it all figured out. He'd made a fortune investing in the rifle market just before the American Civil War, and profited greatly from both world wars. He realized that it was during War that mankind thrived, and that Peace was stagnation. Yes, lives were lost in wars, but it was a fair price to pay for the incredible technological rewards.
He took on the villainous identity of Voltmaster, a gadgeteer supervillain working as a contractor for the Foundry, an expert in the creation of dangerous weapons for other villains, dictators, crimelords, terrorists and other such individuals. All the while, he's been gathering the resources to follow through with his own master plan: triggering a new Global War.
His machinations may have hit a wall following the Battle of Zzzax, however, as he was one of the beings badly affected by the entity's draining powers. He retained his immortality, but found his electrical powers were no longer working, and he has since gone into hiding, researching every avenue possible to try and reignite his electrical powers, or even enhancing them.
-Exit the LoneWolf