I'll jump on that pony too and try to flesh out Volt's rogues.

Obsidian you know, so I'll leave him.

The Highwayman, a dashing and charismatic thief, specialising in leading his gang in armoured car robberies. He takes design cues from 18th century English gentry, drives a souped up motorcycle and his Metapower is having brilliantly fast reactions, even quicker than Volts. He wields either two pistols or two sabres, with equal skill and grace.

 Dr Whitechapel, a misongystic-knife nut surgeon who dabbles in the occult, purely to prolong his own lifespan. Is actually Sir William Withey Gull, the original Jack the Ripper. Has been performing blood magic and radical sciences all these years in an effort to discover true immortality, his life goal to create a world were woman are no longer required to sustain the population. Could also double as an Olympia villain. (He seems a little familiar to Count Corvus, but I'm fairly certain their modus and goals are muuuch different)

The Iron Lady, borrowed her alias from Margaret Thatcher. Complete control over magnetism, with the belief that herself and Volt were 'meant to be together'. Originally tried her hand at super-heroics, but her methods were extremely hard line. After a particularly fearsome battle with some of St Georges goons she accidentally killed several bystanders, and Volt was forced to take her down. Since then she has fled the country and is currently in hiding. 

St George, a white supremacist skin head, who has super strength, durability and hyper aggression towards 'minorities' (Minorities to him being anyone who isn't a white English Catholic) One of the more brutal of Volt's foes, thankfully in jail at the moment.

and Springheel-Jack. Jack is a normal human, but an engineering savant. He built himself a exo-skelton harness that allows him to jump impossibly high and rip open steel. He also developed a skull shaped mask with a super heated blowtorch in the mouth, allowing him to melt through steel. Though he has considerably intellect and amazing inventions, he could never find something to apply himself at. To meet ends meet he eventually started robbing banks, but was swiftly stopped by Volt. Jack is what you would call a '9 to 5' crook, in that he only does what he does for money. He doesn't want to hurt anyone, and is far more likely to run from a hero than to stand and fight.