How about Napoleon Bonaparte from The Reign of Terror? True, he only made a brief appearance at the end of the story, but he's a major historical figure and went on to appear in several spin-offs (Mother Russia, World Game and The Curse of Davros, I think).
There's also the Larvae Guns from The Web Planet, which were missed out.
I thought it was pretty glaring that they didn't have anything for the Abbot of Amboise and I'll have to check when I get home but no James Sterling master spy from Reign of Terror. That'd be an interesting character type that I think is fairly unique for the Hartnell era.
If I can have until the weekend I can whip those up. I know you want to wrap things up but that's just another couple entries.