Luna and Harry's friendship

I like that Harry later on as he got to know her, he truly cared about what she had to say and never really judged her in the extent that ron or hermione would. At times when things were really dark and overwhelming he would go to luna because she often understood him in ways Ron and Hermione didn't.

And in deathly hallows when the golden trio go into luna's bedroom and they see the painting of all of them. And harry realised how much he's grateful for luna's friendship.