Who's This? Who's Who vol.VIII, page 8, the Golden Age hero on a wrecking ball.
How you could have heard of him: The name has certainly seen a lot of use, from the Ghost Rider-esque 90s hero (Alex Sanchez) to whoever that guy was in the 2000s' version of the Freedom Fighters (Andre Twist). Rod, however, hasn't really appeared since ASM. An unpublished issue of Freedom Fighters would have had him killed by Silver Ghost.
Example story: Police Comics #5 (December 1941) by his creator Reed Crandall
I know Firebrand isn't quite as obscure as some of the other characters I've featured in Who's This?, but all those late 70s-early 80s appearances never really got to the heart of who he was as a solo character. Even on the Freedom Fighters, he was kind of a reserve member, only a notch above the Red Bee. You never thought of him when you thought of the FF. Uncle Sam, Doll Man, the Ray, Black Condor, Human Bomb, sometimes Phantom Lady. But never Firebrand. So I really really wanted to see what he was like in the Golden Age, and in large part thanks to Crandall's art, I have to say I fell in love with the character. I'd read a Firebrand book today if it could capture the same dashing vibe, I really would.
Who else? I have half a mind to do Firefly, but I think there's wayyyyy more obscure in Who's Who volume 8. In fact, it features two Forgotten teams. I bet I could do something with that.