I'm really not sure who could play Luna in the movie but whoever they choose I really hope it's someone who cand do the character justice. I mean, most people (e.g. her peers at Hogwarts) just think of her as ditzy and weird a.k.a Pheobe from Friends but I think she's much more insightful then that, she sees things in ways that other's don't and there's an undeniable truth to the things she says even though she does have an odd air about her she is very tolerant and civil to the way peope treat her. Hence I hope they don't portray her as just a wack job and show her for the quite cool character she really is 👆