("The schematic has already been laid down. Your task is to plug your own ideas into that context, which for some writers is where the process becomes quite difficult. You're required to work with characters created by someone other than yourself .... and set aside your ego when when the producer says, "Our character wouldn't do that" ...)
http://toobusythinkingboutcomics.blogspot.com/2010/07/j-michael-straczynskis-superman-hero-as.html