Here is someone that I think would make an excellent choice. She is very young, smart and would make the forthcoming Doctor look more mature.

Emma Watson, she can be very funny yet appear intelligent and is growing into a beautiful woman. Certain would be a great catch for the show, if even for only a season.

The official website of British actress Emma Watson
Source: www.emmawatsonofficial.com

After the disappointing choice for the doctor, its not surprising that they have even more disappointing choices for the assistant!
Heres a wild idea....how about casting a real actress? Not a bloody singer or supermodel, but someone who might actually be able to carry a scene without resorting to fluttering eyelashes and flashing some leg.
So far I've heard that Lily Allen, aygnes deane, kelly brook and rachel stevens are in the running for the job......o dear
just, o dear

For god's sake, let's mix it up a bit! How about someone nearly as smart as the doctor? Eienstien as a companion? How about a cowboy? A neanderthal? An ancient greek? Think outside the box.

No a young woman. And NOT British.

I definitely think two companions are in order.

One of them should be John Oliver, but I suspect that is not the direction Moffat will go in.

If they go with a musical talent from the UK, how about Kate Nash?

Jenny (His DNA Daughter) would be the best choice. It would be a new type of relationship from previous companions, and it would have the additional element of him not being the sole time lord in existence (although others do seem to keep popping up anyway). It is sort of a loose thread for there to be another time lord out there, his daughter no less, who he never contacts.

I would like to see two female companions,with polar opposite personalities .One is nice to him but secretly hates him (to be revealed later in the season maybe) and the other is mean to him to hide that she's secretly is in love with him but can't tell him because she is already married!In other words companions with a lot of baggage.

Anna Friel is a great call for this!!

How about Anna Friel. She's freed up from Daisies and is beautiful and british.

To completely change it up, why not have a male companion who needs to travel with the Doctor for something tangible. Like they're searching for some one or something.

So far all three companions have been there for the same reason, travel and excitement. They end up totally devoted to the Doctor because he's the only one who can provide that for them. If you have a companion who needs something else then I think a world of interesting choices can open up, as they may not always have a slavish devotion to the Doctor, as there may be other avenues to getting what they want.

Plus with such a young actor it'll be tougher for him to have such an authoritative presence. Prior male companions, especially Mickey, were prone to competition with the Doctor, and I think now is the perfect time to explore that idea.