I first encountered Black Lightning in the DCCP issue you mention. It was pretty awful, but I liked the character and didn't understand why he and Superman didn't get together more often, seeing as they lived in the same city and all.
After a certain point, like I said, he was associated with Batman; come OUTSIDERS, he was teaching in Gotham City and not Metropolis, for instance. The window to bring Black Lightning into the Superman Orbit closed and that DCCP issue was one of the few where he was actually part of the extended Superman Family.
In fact, nearly all the Outsiders came into Batman's orbit somehow; the Outsiders reminded me to an extent of Wings, with Batman as Paul McCartney.
I suppose a lot of people thought of him as a rip-off of Luke Cage (or indeed the Falcon), but I thought he was a clearly different character, more level-headed and certainly less of a stereotype than the Hero for Hire: an Olympic medalist and an English teacher, he wasn't the average Afro-American comic book character.
Black Lightning really bucks the trend here. Usually when DC apes a Marvel-originated trend you get something painfully uncool and derivative: e.g. RICHARD DRAGON, which did not have one tenth the coolness and weirdness of IRON FIST.And whle Marvel had the license for CONAN THE BARBARIAN and KING KULL, DC was left with (ugh) WARLORD under the always awful Mike Grell, and ARAK, SON OF THUNDER (which actually was surprisingly cool and historically accurate - welll as historically accurate as a book about an Indian running around Charlemagne's Europe with a Satyr sidekick gets, in no small part due to the guy that was putting out CONAN, Roy the Boy Thomas himself).
Black Lightning was not your usual black hero in a few ways: 1) he was white-collar and educated, and the whole afro and jive talk was a part of his secret identity; 2) he was not a sidekick to a white hero; he can't be compared to Bill Foster (Black Goliath) or the Falcon (who was a great character that served a great purpose, but still).
Well, except for the fact that he lived in Da Ghetto.
Oh, not just ANY ghetto - Suicide Slum. Tony Isabella was very, very big on the shared DC Unverse, and so he put Black Lightning in Suicide Slum, which apart from the SUPERMAN'S PAL, JIMMY OLSEN issues, to the best of my knowledge was the first time that Suicide Slum was brought up in a non-Newsboy Legion context.