Mitch Marner definitely isn't known for his physical game and wouldn't be considered a physical threat on the ice. That hasn't stopped him from becoming an effective two way player though. He has showcased his abilities on both ends through these last few seasons. A year ago, he actually managed to finish third in Selke voting.
It's possible now that without Bergeron in the way, Marner may be one of the top candidates to fill that role. TheHockeyNews has put together a list of 5 players who could carry that torch and Mitch has made his way onto that list.
It's clear that Mitch Marner has definitive offensive ability, hitting a career high of 99 points a season ago. He's finished with 90+ points 3 times in his young career. Aside from all that though, he has also showed elite capability in the defensive end and especially on the penalty kill. Over the last few years, Marner leads the NHL in takeaways on the penalty kill at 45, while also being second in short-handed points. He's undoubtably a candidate for the Selke trophy, it will be interesting to see who else emerges.