Re: OOC [Out Of Character]
Absolutely any of them. :D The characters are companions. It might be better if you give me an idea what sort of character you would like to play, and I can suggest who would be a best fit. There are some pretty obscure characters that most would not know about, but are still canon, which would give you free reign to develop and play them in whatever way you prefer. Most of the TV companions are very well established, but there are characters from the comic and audio stories that only a true hardcore fan would know about, so you could really go to town on it, and I could tell you what backstory stuff you need.
The game concept is that the Doctor is GONE. Completely. And it is your job as a friend to find out how, where, and why. You'll be dropped into adventures. You really do not need to know very much about the series to play it. The information you need will be revealed as the plot progresses. Depending on who you play, you might not have a clue what a Time Lord or a Dalek might be, so detailed knowledge of the show is really not important.
I've got two characters now (one still needs setting up, I shall do that when I have time) and I can run with three. Even better with four!