Neville might have remained a lovable dork in the Harry Potter universe but, in real life, Lewis was maturing into a handsome young man. To keep in character, drastic measures were taken, as he explained to The Independent. "When we got to film three, and I'd got quite tall and slimmed out a bit, they decided that they were uncomfortable with that, and thought, 'No, we need to make him a bit geeky looking', or geekier, I should say, so they put me in a fat suit and false teeth," the actor revealed. 

Lewis told fans gathered at a panel during Universal Orlando's Celebration of Harry Potter that it really affected his self esteem, as reported by People. "Being 15 years old in the middle of puberty, having to wear a fat suit. There's girls around; I've got this fat suit on every day. No one knows I'm wearing this damn thing, they all just think I'm fat," he admitted, reflecting on the process.