potential doctor who companions in an ideal world

• A skilled artist, very much the sort of person who’d be overjoyed to learn about art throughout history… but they’re a cave painter from 6000 BC who’s only just learned what a pen is
• The typical “person who has a monotonous minimum wage job where they don’t realize their potential as a person” but they’re a roman working at one of those ancient fast food places
• Mechanic who’s fascinated by the TARDIS and gets very good at learning the controls/fixing all the weird biotech and the Doctor has to deal with the TARDIS continuously siding with her New Favorite Companion. The pure opposite of the TARDIS not liking Clara.
• K9 again
• Alien historian who wrote their thesis on humans and is really, really delighted to end up in fantastic places like “a small town in wales, 2013″