Back on topic. Someone who found one of Osborne's Goblin lairs and would adapt the technology for their own use without the stigma of Green Goblin by making the glider more bird wing like and making the gear with a angelic motif.
Hence DarkAngel ala Dark Champions: TAS. Personally I would only change things slightly and be called The Gremlin if only to oppose or annoy Osborne.
Superheroes almost never answer their emails from trolls. Supervillains however not only reply but usually track down and give the sender the same answer: Painful Death.
By day he is Brick Mason, billionaire playboy and lawyer. But when night comes and evil stirs, he is Captain Swashbuckler! Flying his advanced aircraft, The Jolly Roger, CB ensures that the innocent are kept safe.
The Golden Age was the time where the dumber the origin, the better the hero or villain. ("Your character was stung by bees that drink from the mystical fountain of youth and that gave you the power to shape change into any animal every time you say the magic words - PONCE DE LEON! - three times in a row? Works for me.")
ShadoWraith's quarters will have been made up like a Samurai's home in Ancient Japan complete with paper walls and rock garden though it has also a microbrewery.
Sledge is dead; killed off by Viper. Geodesics became a pi agency in an old AC issue or became evil in Dystopia, an independent adventure module from the same company that made Foxbat Unleashed and Blood Rage (I think).
Darkon does not ring any bells.