Introducing Randy's father, Hrothgar. Much to Randy's embarrassment, Hrothgar is an anti-hero called "Black Lightning", and strives to put a stop to Professor Blackheart's schemes with his medieval longsword, dirty fighting, an analytical mind and a biting wit.
Unlike Dark McPlaidshirt, Black Lightning works under the radar and doesn't seek glory or fame, nor is he out to impress anyone or pull any punches. Professor Blackheart, in fact, doesn't know he exists, despite all the damage he does to his underlings and his plans.
He's also a master of the insult, not unlike Groucho Marx.
Hrothgar is named after a character in the Old English epic poem Beowulf, a Danish warrior king. Like the heroes of old, Hrothgar is brave and unapologetic, and isn't clean-shaven in any way.
I'm well aware that there's a DC superhero named Black Lightning, but he's so blasted obscure that I doubt anybody would give a darn.