Rose Tyler
From Canonwars
Rose Tyler! Companion! Doctor's girlfriend!
Rose comes in after the events of the Second Season of the new Doctor Who, which I will not relate here due to spoilers. I'll type it up and post it when the run is over completely in America! At any rate, she currently lives in the TARDIS, with the Doctor, and works at a Barnes and Noble with Namine and Roxas.
Her journal is trackiebottoms, and she is played by Lins. Her Avatar is, of course, Billie Piper.