John Farrell said:
Rose Tyler
Rose started out normal enough. She was young, inexperienced and had just left with a strange man to see time and space. With 9, their relationship was sort of like teacher and student. And I can get why 9 decided to take a companion. He wanted to ease his loneliness and return somewhat to the way things were before the time war.
Then the Regeneration happened. Gone was the more open brooding, replaced by a carefree personality hiding survivor`s guilt. The teacher-student type relationship gave way to something akin to two teenagers on a roadtrip. Rose grew a lot quicker during the second season. Then she left the show.
Martha Jones could almost be a Sue, but the key difference is that...I actually felt sorry for her. She quickly fell in love with 10, but he was oblivious, focusing on his lost Rose. Never felt like he was talking to her, but Rose's ghost instead. It's that tragic quality that holds her above Sue status in my head.
Donna was my favorite companion, as she felt like an actual companion instead of a potential love interest. With her feelings of inferiority and brash nature, I almost cried when the mindwipe happened.
The elevation of Rose to Sue status is something I disliked following her departure. When she returns, she is incredibly competent, she gets to keep a clone of the Doctor, she gets to live in luxury with her dead father, yet at the beginning she abandoned her mother and boyfriend to travel with the Doctor. She used to get called out on this. I still like her original tenure, but after she left, whenever she comes up, I just want to bash the Doctor's head in. Hey Doc, if you're so lonely, why don't you visit your granddaughter Susan? At times I questioned whether I was watching the sci-fi equivalent of Twilight.
THIS, so much this.
And somehow, all the Whovians in my family HATE Donna for some reason - but she's my favorite Tennet Companion, she's the only one that feeled like the writers sat down and said "Okay, what characterize the Tenth Doctor and what character will work the best with him?"
And I personally don't feel that River is a Sue. For me, a Sue needs to take the spotlight to herself - Something that River doesn't really do. Sure she gets a lot of awesome moments in "Her" episodes, but she never saves the day, she never make the clever plan to defeat the enemy - She's smart, she knows stuff that thedoctor doesn't know, but he's still clearly smarter than her.
Forest of the Dead - The Doctor figure stuff out, and while River made a heroic Sacrifice, the plan was all the Doctor's
Flesh and Stone - The idea of throwing the angels to the crack? the Doctor
The Big Bang -Plan how to solve the shit that happened in the last episode? Doctor. Big Bang plan? Doctor. Saving the Doctor? Amy
Day of the Moon - The Doctor saved the day
A Good Man Goes to War - River only did two things in this episode, non of them were saving the day
Let's Kill Hitler - River was the antagonist of the episode, and while she saved the Doctor's life - it was thanks to the Doctor that she turned good
The Wedding of River Song - the one who screwed everything up in the first place, the Doctor fixed it and cheated death
And I'm pretty sure Susan died in the Time War.