David Michelinie has spoken out about people who get credit for creating certain characters. He says that Marvel claims a administrative rule at the time from inside the House of Ideas that may have produced some inaccuracies. Amongst the character he claims are Venom, Carnage, Scott Lang and Taskmaster.
Scott Lang, one of Michelinie created characters.
He wrote on Facebook
“Feel free to add ‘co-creator’ to my credits as much as you like. But the bottom line is that I alone originatedthose characters, I was the first to think of them, I brought them into this world, and if I had never been born those characters would not exist. And there’s not a fact, opinion or argument that can change that.”
He further explained “Marvel’s initial policy declared that, for them, the first person to write a new character and the first person to draw that character were technically and legally the creators of the character, regardless of who had come up with it or when the character was actually first published,”
Marvel credits as, Michelinie co-created Venom with Todd McFarlane, Scott Lang with John Byrne, Carnage with Erik Larsen and Mark Bagley, and Taskmaster with George Pérez.