Mostly, I'm drawn to great characters and great worlds that use weird things for their language - whether it's dance, whether it's pop music with Justin Bieber, or whether it's magic.

I see myself doing Harry Potter films as long as I'm enjoying it and as long as they are going to challenge me as an actor. I want to be an actor - it's my aspiration - so I want to do other films. I want to write something and I want to direct something!

Just keep acting is my plan, I just want to keep going for as long as I can. I've had a fantastic time on Potter, I will be very sad to leave it because every time I look back on one of these films, every scene I watch will be forever linked to a memory of what happened that day or something that was happening around that time in my life.

When you get as lucky as I got, you have to work as hard as possible to earn that luck.

My favorite phrase, that a friend of mine who worked on the Potter films and was a lot older than me would use in front of me, and I picked up from him many great phrases - the English have a lot of great idioms for sweating. I don't know why that is. But that's what we do. I feel like it's particularly our country; probably everywhere has a lot of idioms for sweating. He always said, "I'm sweating like a glassblower's asshole," which I always found an incredibly strange and yet vivid image.

Potter for me is something that's been giving me these amazing opportunities to start a career and learn while I'm doing, which is the best way to learn.

Being self-critical is good; being self-hating is destructive. There's a very fine line there somewhere, and I walk it carefully.