William Karlsson
It's already been highlighted how William Karlsson would have a great backstory told by Thor himself, Chris Hemsworth. How fitting would it be to have the Marvel superstar play the Swedish star in a movie? But Karlsson would also be a good fit for a docu-series for various reasons.
The Stanley Cup parade speech is one, with a behind-the-scenes look at what prompted the center's praises for Jonathan Marchessault. But let's look at other aspects of his life other than the speech. It's the low-hanging fruit associated with Karlsson, so there must be some other things that make the beloved "Misfit" interesting.
Luckily, there is, starting with his dog, Obi. Fans can get an in-depth look at the Golden/Jindo mix's life and the backstory behind his journey to William Karlsson's life. That includes surviving a Korean dog meat trade and playing with his beloved pet parents.
There's also his love for his favorite sports club, AIK. The Swedish forward can talk about his passion for the team and how he wanted to play for their soccer team growing up. There's plenty of material to work with regarding the "Original Misfit," which would make for a riveting viewing experience.