Luna, after
Sometimes, when they are in large open areas Harry catches Luna acting skittish. Not in any particular way; that is to say, she still acted like Luna but her movements were slightly more controlled and she never met anyone's eye.
Other times it is in small spaces, he asks her if she's claustrophobic and she shakes her head. He already knew that that was how she would answer and only a small part of him doubts her words.
Another time he catches her, quite by coincidence, in a muggle chemist holding up blue hair dye. He puts it back on the shelf and leads her outside. He sits her on a bench and wraps his cloak around her until she stops shivering.
He is so happy when she meets Rolf because for the first time in so long she looks like she might still believe in nargles.