There were ten truths Donna Noble had found out about the Doctor , the tenth incarnation about the Time Lord she was travelling with in his TARDIS.
He liked to hug, a lot
He was too skinny for words, she thought if she hugged him for too long, she would get a paper cut
He only wore those glasses of his to make himself more intelligent
His hair. He spent more time than her in the bathroom gelling it up
He said Allons-y A LOT
He ran a LOT as well
The amount of tea he drank , it wasn't normal
She couldn't even eat a pear, use pear scents, or have a pear in close proxminity without him complaining that he hated PEARS
Once, she caught him with a far away look in his eyes, assuming that he was remembering Rose or the Time War, that, or his lost family and friends, or Gallifrey. He talked a lot , but never talked
She knew he was an alien, she knew he wasn't from Mars but she called him Martian, Time Boy, and Spaceman just for that smile.