Spider-Man is the most famous of Steve Ditko's Creations, but he also has had an impact on the DC Universe as well. Here are a list of the DC Heroes that Steve Ditko has created or co- created.
1. Blue Beetle https://en.wikipedia.org/wiki/Ted_Kord
2. Captain Atom https://en.wikipedia.org/wiki/Captain_Atom
3. The Creeper. https://en.wikipedia.org/wiki/Creeper_(comics)
4. The Question https://en.wikipedia.org/wiki/Question_(comics)
5. Hawk and Dove https://en.wikipedia.org/wiki/Hawk_and_Dove
6. Nightshade https://en.wikipedia.org/wiki/Nightshade_(comics)
8. Shade, the Changing Man https://en.wikipedia.org/wiki/Shade,_the_Changing_Man
9. Odd Man https://en.wikipedia.org/wiki/Odd_Man_(comics)
Many of these characters had long runs at DC. Also not that many of them were a part of the DC acquisition of Charlton Comics.
And of course, Steve also created many villains and back ups characters as well.
To Be continued.
Go forth and do well,