Since I don't know the exact Fan Man Yee story, I can't say for sure. But generally, a story about a person can be significant in terms of inspiring others, documenting a certain culture or era, or showing the unique journey of an individual.
Shinjo Masayuki was a Japanese manga that told the story of Shinjo Masayuki, a high school student with magical abilities. After he accidentally obtained the ability to freely manipulate water, he had various encounters with various characters in school and in his daily life. The manga was released in 2009 and is still being released.
There's no public knowledge indicating that Michael Sheen reads fanfic. It could be that he's never been asked about it in interviews or he just keeps it private if he does.
It's hard to say for sure. While the idea of him reading fanfic is out there, there may not be a lot of public information about it. However, considering the trend of actors being more involved with their fan communities, it wouldn't be a surprise if he has read some fanfic, perhaps in his own private time or as part of a special event.
Well, it could be a really interesting and unique concept. Maybe it shows his connection with the fan community. It might also be a way to explore different interpretations of the characters he has played in a more creative and unscripted manner.
I'm not sure if there is an official video of Michael Sheen reading fanfic. He is an actor who might be involved in various creative and fan - related activities, but this specific one may not be widely known or publicly available.
The chances are hard to determine. Since there's no information about his interest in fanfic, it could be anywhere from very low to moderately high if he has a secret love for it.