I don't suppose there is. But you had better define what you mean by "character".
No, it's the talent's fault, the writers and the artists working on the book, not the character itself.
How can you separate the character from the creative team? We were talking about Green Lantern recently. If Mr. Nodell had drawn up his plans for Green Lantern, written out a list of his attributes, described his personality, created a costume, etc., is that the character? No. The character is more. The character is Alan Scott, Green Lantern, the train wreck, how the man acted in his first story, what he said and where he went. And he's redefined again in the next month's comic, and so on. The initial sketch by the creator is left far behind, and rather quickly.
If that's what you mean by character, I think you're right.
But there's still more to it.
Same thing with Captain Marvel, why was he so great during the Golden Age yet DC has never been able to really recreate that magic? Because, the people who were choosen to work on his comics were not as good as Otto, C.C, and Kurt.
You can't separate a big success from its time and place, and give all the credit to the drawings on the paper. There's also the audience to take into account; or, put another way, the market of the time (and place). Captain Marvel was such a success because of these things. Otto Binder, for all his personal trumpet-blowing, was not the be-all and end-all of Captain Marvel's success. And as for C C Beck: how good an artist was he really? Perfect for the time, and perfect for the character at that time. But didn't the likes of Bob Oksner work on the Marvel Family in later years? Oksner is a fantastic artist, and far superior to Beck. Something of the readers of that time responded whole-heartedly to Beck's concepts (noted for their simplicity), also of that time.
Therefore, we are all really fans of writers and artists rather than Characters, more so than we might be willing to admit.
Not "rather than". It's inclusive, I think. The character is what the creative team of the moment, in communion with the reader and the marketplace, says he is. It's how he's portrayed, and how he's received.
You can't say to me, "the character of Batman". I would have to ask, "Which character out of a hundred different Batmans?"
If you asked me to write a description and make some sketches about who and what Batman is, I'd be a mess. WHAT do I leave out, and WHAT do I put in? So no "character" is foolproof.