That gets even more confusing, because Kirby and Ditko are both writer/artists who arguably compete with Lee as prolific writers.

All three (Lee, Kirby and Ditko) have created tons of characters. I recall Doug Moench in AMAZING HEROES 100 said that 75% of writers and artists in the industry at that time were employed working on characters and series created by Kirby. Much of it co-created with Stan Lee.

It occurred to me a few years ago that Stan Lee might be the most prolific and published writer on the planet. He produced an incredible volume of stories and series, constantly in print collected in book form, and a legacy continued by countless others. And now continued in films, TV series and animation as well.