Like I said, it's a tough one.

In 'The Amazing Adventures of Kavalier and Clay' the author mentions tons of minor heroes who ran as second features in The Escapist. All we know about Unum is that he's a super scientist. His name comes up twice. The second time he is fighting the evil 'Smarty' Pants, who has brought the Statue of Liberty to life. Unum stops her with a giant Clark Gable robot.

There's no description of how Unum looked. I picture him as wearing a tricornered hat and a lab coat. A gun belt with a Colt .45 revolver and a ray gun. Engineer boots and jodhpurs. A cross between Ben Franklin and Doc Savage.