Author has written 8 stories for Doctor Who, Primeval, and Psych.
I am the mother of four children, aged 15, 10, 4, and 2. I run a restaurant in an 1860's era hotel in rural Wisconsin, and I dabble in fanfiction. I tend to like crossovers because of the opportunities they provide for illuminating different aspects of a character or setting.
I'm currently writing primarily Doctor Who stories at present, though that could change. Davison is "my" doctor, though he's actually my third favorite, after Baker and Tennant. Not too sure about the new guy, but I haven't had much opportunity to watch TV for a long time.
Concerning Alex, my Doctor Who OC with that most embarrassing of social diseases (Google Kakrafoon): Mary Sue--maybe. But a lot of the protagonists of YA novels are a bit Sueish. She has become a more interesting person as my children have grown, and she's taken on some of their quirks and flaws. Yes, she is fully human, and no, she doesn't have a fob watch. Oh, and if you come late to the series, she's eleven. I don't always remember to state her age explicitly. She speaks in American idiom because she's from Kenosha, Wisconsin. Alex is an experiment, (author's experiment, I mean) taking a character who inhabits an original universe and allowing an alternate universe version to interact with the Doctor. Alex in the Doctor Who universe and Kate in the Observer Effective universe are like Mickey and Ricky in Doctor Who, more or less.
Da Rules (subject to change without notice):
I bend the canon, but try not to break it. (New stories or characters have to fit in plausible holes within the original work's timeline., which is why Alex's tenure occurs between the end of Martha's tenure and the start of Donna's.)
Psychic abilities do not vanish just because it's convenient to the plot. Nor do they become ridiculously powerful just because it's convenient to the plot. (Mostly because then you're stuck with them later.)
TVTropes is my other favorite writing website. I could get lost in there for days.