“Every job I do, I like to think it makes me better or I learn things,” he says. “It’s all about how much something’s going to stretch me or test me. It’s like that saying, ‘If you do what you always do, you’ll get what you’ve always had.’ You have to do things you don’t know you can do.”

“When I’m doing a film, I’m in my comfort zone, but onstage I’m not,” he says. “Theater sharpens you up. Sure, you can achieve a great performance, but can you achieve it night after night?”

“Because I have a very recognizable face, whenever I have an opportunity to change that face” — by, say, donning horns — “it’s very exciting for me,” he says. “It’s possibly one of the reasons I find doing accents so freeing. It’s such a transformative thing.”

“I’m pretty terrible at the work-life balance,” he says. “Because I earned very good money doing ‘Harry Potter,’ it’s counterintuitive for a lot of people that I would work so hard now. But I’ve been working since I was 9, and I’ve never known a life without a film set.”