"As an actor, I've grown and got more experience," he tells PEOPLE

By Michelle Tauber
Updated January 30, 2016 03:25 PM
Credit: Gerardo Mora/Getty

But is the once-and-forever Neville Longbottom – official Triwizard Champion of Underdogs and possessor of the ultimate PPT (Post-Potter Transformation – equally hot with a semi-handlebar mustache?

Only Hannah Abbott knows for sure, but we do know the actor, 26, grew the ‘stache for his role on the British series Ripper Street – and he’s been having some fun on Instagram with whether Neville would approve.

Lewis is among the Potter stars attending Universal Orlando’s three-day Celebration of Harry Potter event Friday through Sunday, along with Katie Leung (Cho Chang), Bonnie Wright (Ginny Weasley) and Evanna Lynch (Luna Lovegood).

Now that nearly five years have passed since the release of the final Potter film, 2011’s Harry Potter and the Deathly Hallows – Part 2 the star says he looks back on his work in the series and cringes.

Any scenes he’d especially like to do over?

“All of them!” he told PEOPLE on Friday. “It’s hard to narrow it down to a particular scene, because it’s not like I would say, ‘That one scene is dreadful.’ I think they’re all dreadful. As an actor, I’ve grown and got more experience.”

As for anything he’d do differently off-screen during those years, he says, ” I feel the experience we all shared was such a great unique thing, I wish maybe I’d been a bit more aware of that at the time and appreciated it more. I would have tried to enjoy it more, but I did have a great time. I guess my advice would be, ‘Enjoy it while you can.’ ”

And there’s even more good news for west coast Potter fans – a massive themed park is coming to Universal Studios in Los Angeles!