"I think my English is pretty good now. I think moving to Vancouver and speaking it every day really helped."
Rasmus Dahlin can relate.
The 19-year-old defenseman, a fellow Swede who was selected by the Buffalo Sabres with the No. 1 pick in the 2018 NHL Draft, was under much the same public microscope as Pettersson last season.
"I understand what [Pettersson] means," Dahlin said. "You can't really show your real personality because you don't know the language as much. For me, it kind of looked as if I was pretty shy at the beginning to my teammates and all the people around, but it was just I didn't know the language."
But language wasn't the only barrier.
Pettersson, after all, was a teenager when he entered the NHL. He had to navigate countless grown-up tasks from the beginning, including where to live, securing a driver's license, and assimilating into a new culture.
"There was quite a bit (of growth) in him last year," Canucks defenseman Erik Gudbranson said. "He's a good kid from a great family. But he's still a kid, right? That's not taking anything away from him. He's allowed to be a kid. But you get thrown into the situation he was thrown into in the market he was thrown into, he did incredibly well.
"This is just a kid that wants to come to the rink and play hockey, score goals, and make nice plays. But there's a whole other side to it. You're getting your first paycheck. I had summer jobs as a kid for sure, but not those paychecks. Finding a place to live, taking care of a car and making sure that side of your life is being taken care of. He lives an [nine-hour] time difference from his friends and family. That's a long way to go. It's not necessarily as simple as flying to a new place and stepping on the ice and playing the game. There's a whole bunch of different angles as well."
Simple things, like going out for dinner, were productions for Pettersson with his profile growing rapidly. He said it took a while to get used to being recognized the moment he left the aren, that it made him uncomfortable.
"I wasn't used to it at all," Pettersson said. "I probably still am not used to it that people idolize me and stay up late just to watch me play hockey. That's just crazy.
"It happens even here in Sweden. I remember walking home from a restaurant here in Stockholm and a guy came up and said, 'Hey Elias, great season! Go hard,' and there was nothing more. I mean, [Stockholm] is not my hometown. It's the capital of Sweden, so …
"I think for me just to make kids happy is the best thing ever. That I can make someone's day just by signing my ugly autograph -- OK it's not ugly, it's all right, it's my first one -- but that I can make people happy is awesome because I've been that kid, too."