Seeing a thread about whether Marvel could use Galactus got me wondering this. I get that if you were negotiating the rights for say the Fantastic Four you'd expect it to include all four main team members and probably things like Dr. Doom but are there packages of characters that say Marvel or DC simply give when leasing the rights to a certain franchise? Are the movie studios going to the companies with a list of characters the want included when they set up a franchise?

For example, did the creators of Arrow have to know in advance to ask for things like Huntress or Ra's when they initially requested the other characters? Would they approach DC everytime they wanted to use a character (or at least one not associated with Green Arrow)?