Since there were a lot of actor and writer quotes for Clara I want to include the ones about Rose as well. Hope they can be include as separate arguments like hers are too. I have quoted from multiple actors and the producer Julie Gardner but I’ll just share RTD’s quotes for now.
RTD: “What Rose brings to the Doctor’s life is completion. It’s completing a circle – he’s male, he’s alien, he’s a traveler. Between the two of them together they complement each other and discover each other. And are in love with each other – absolutely, unashamedly, unreservedly”
RTD: "Finally they get to this wrecked, deserted, night-time, battered, Dalek-invaded street – civilization gone. Across the greatest possible distance, there they are, her with a great big gun, him with the Tardis, and they run toward each other like the biggest romance you’ve ever seen in your life.”
RTD: “From the moment they meet, the Doctor and Rose are soul mates. They understand and complement each other.”
RTD: “He’s a very damaged and closed man. She brings that out of him. She brings him back to life. She widens his horizons.”
RTD: “When the Doctor met Rose, that was a very different Doctor, that was a lonely, damaged man; his entire planet had been wiped out. Rose helped him move on from his terrible grief he’s been dealing with. She knocks off the Time Lord edges and humanizes him just as he Time Lords her. They were what the other was lacking, they are inseparable.”
RTD: “Rose met the most fantastic man in the universe who actually thought she was the most fantastic woman in the universe”