I imagine Harry is going to confuse her a little at first since he has her boyfriend's face. I look forward to that chaos, honestly. ;)
Natasha doesn't know MJ, but she probably will like her as soon she meets her, seeing as she's a brilliant and sarcastic girl and that seems to be Nat's favorite. Can't wait to see those two interact, if I'm honest.
The Doctor will bet he Doctor. She loves young proteges so we'll see!