So, out of the three regular companions I've actually watched out of new Who (I haven't seen any of season 5 yet), I think Donna is my favorite. Don't get me wrong, I love Rose, and it's way fun watching Rose and Ten dork around in season 2, but I can't resist Donna, especially when she gets all yell-y. That is the best thing ever. I like Martha a lot too. My sister feels like she is creepy for macking on the Doctor all the time while he's busy being sad over Rose, but really, I can't blame Martha for that. Maybe because I'm creepy too.