I really love the term “companion.” It says nothing of age, gender, race, social status, or even species.  They can be lifelong friends, family, rivals, or even complete strangers who just happen to be traveling in the same direction however briefly.  

Susan Foreman one of the Doctor’s first companions.

Experimenting with color palettes and screentones.

I should’ve known. It’s not about showing you the universe. It never is. It’s about the universe doing something for you.

"You know when you really, really like someone and you don’t wanna mess up, and you end up just messing it up by trying not to? I think there’s an element of that." - Samuel Anderson, DW Extra 1x04