First of all, if you look hard enough, you can find similarities between any two characters. Sure there are similarities between Spidey and Bats/Supes, but most are purely coincidence. Some were intentional, like Peter Parker originally needing eyeglasses, but that was soon dropped by Lee & Ditko. You have to understand that these companies were, and still are in direct competition with one another. DC has “borrowed” just as many ideas from Marvel as Marvel has from DC. As for the newspaper job, Peter Parker no longer works for the Daily Bugle, but when he was employed there his job was not even closely related to Clark Kent’s at the Daily Planet.
As for your list:
Joker - Green Goblin: Ok, I see the “green” connection, and the insanity, but that’s about it.
Catwoman - Black Cat : I’ll grant you this one. These two are a little too close for comfort. But last time I checked, Selena didn’t have superpowers.
Killer Croc - The Lizard: They’re both reptilian, but that’s it. BTW, the Lizard first appeared almost 20 years before Killer Croc.
Batgirl - Spider-woman: Again, explain this connection. I'm pretty sure Spider-woman has been written out of the Marvel Universe, but I could be wrong.
Copperhead - Scorpion: One’s a snake, the other's an arachnid. Also, the Scorpion was introduced about 3 years before Copperhead.
No offense, but this thread stinks of another DC versus Marvel topic, and we don’t need any of that.