Dominant Se: Donna loves excitement and new experiences. She doesn’t hesitate to jump in and be a part of things, whether it’s attempting to adopt the language or slang of a culture she finds herself in and she loves to dress the part. Donna is aware of her physical environment and points them out to the Doctor (who isn’t always quite as aware of the same). She likes to sit back and relax from time to time –for instance, sunbathing while the Doctor goes on a new adventure. Donna is very spontaneous, and can act in the moment to save the Doctor’s life. She’s bored when she feels like she’s not doing anything interesting or new –so basically her life before the Doctor…BORING.
Auxiliary Fi: Donna knows what she thinks is right or wrong and often intervenes in the Doctor’s choices to persuade him to make more ethical decisions. She has emotional outbursts whenever a difficult moral decision is at hand and she has a hard time adjusting to the frequency of death involved in the Doctor’s lifestyle. But due to her strong sense of morality, she’s willing to argue with him in order to achieve what’s right. Donna resents the way her mother treats her and doesn’t particularly enjoy being told what to do.
Tertiary Te: Donna is able to organise sort of, enough to work as a temp, but not enough to hold down a long-term job. If the Doctor goes against Donna’s ethical code, Donna acts against him and speaks bluntly to help him see sense. Donna wants to be involved in every bit of the Doctor’s business and doesn’t like to be told to sit on the sidelines for anything. She speaks her thoughts out loud quite often, pointing out her observations (usually things the Doctor didn’t notice). She’s cleverer than she thinks, and when the Doctor’s brain gets regenerated into her head, she’s reluctant to let go of it.
Inferior Ni: Donna isn’t that great at figuring out the big mysteries, but she is able to notice patterns that the Doctor doesn’t always catch on to. In general however, she tends to leave the intuitive problem-solving to the Doctor.
Apparently some people seem to think that Donna is an ESTJ. I for one happen to have a mother who is a total ESTJ –and Donna is the last person I would ever type as an ESTJ.
She’s way too spontaneous to be a Te dom, and her emotions come out in sensitive torrents rather than blunt-anger torrents, so there’s no way she could be a T type.