Not many Roadfooders here in the central Ohio area evidently. So here goes with my contribution from mostly the Heartland.
Starliner Diner, multiethnic cuisine, Hilliard, Ohio
Matthew's, home cooking, West Jefferson, Ohio
Tommy's Diner, Greek influence,Columbus, Ohio
Lily's Kitchen, home cooking, Grove City, Ohio
First Watch, Hilliard, Ohio
Bob Evans, home cooking, assorted locations, Ohio
Waffle House, assorted locations, Ohio
Harlow's, Mexican influence,Tempe, Arizona
Chompies, Jewish influence,Tempe, Arizona
And I'm certain there are many more restaurants here in the Columbus area that are notable, but we haven't tried them all as yet.