We don't really know who Buster is just from this title. He could be an ordinary person whose story has been told to illustrate a particular point about having a'mal heart', whether it's about his character flaws or some sort of misfortune he has faced.
I'm not sure about the absolute best, but there are some authors who have a good reputation. Some of the ones who are often recommended might be those who really dig deep into the characters of Crabbe and Goyle. They don't just write them as the typical bullies but give them more complex personalities.
I'm not sure exactly how it's described as I haven't read that specific fanfic. But it could be through direct statements like 'Crabbe weighed ten pounds more than Goyle' or more descriptive passages about their physical appearances related to their weight.
One interesting fanfiction could be about Crabbe and Goyle having a change of heart and turning against the Dark Arts. Maybe they realize the harm Voldemort is causing and decide to help Harry secretly. Another could focus on their friendship before they got involved with the wrong crowd at Hogwarts, showing a more innocent side of them.
For Buster, he might start off being a bit intimidated by Montana Max's wealth and bravado. But as the story progresses, he could grow more confident in himself and stand up to Max when necessary. This would show his development from a somewhat shy character to a more assertive one.
He might infuse the sword with his chakra. Since Naruto has a large amount of chakra, he could make the Buster Sword glow with his unique chakra color. This would not only make the sword stronger but also give it new abilities. For instance, the chakra - infused sword could cut through stronger defenses or even repel enemy ninjutsu.
Sadly, without more in - depth research, the exact story of Buster Douglas' mom remains somewhat of a mystery. But in the context of an athlete's life, his mother could have been the one who instilled values in him from a young age. These values might have included perseverance, discipline, and hard work. She may have also been there to cheer him on during his matches and pick him up when he faced setbacks. Her influence might have been a silent but powerful force behind his success as a boxer.