I'm not sure who Trevor Holt specifically is in this story without more context. It could be a fictional character created for a particular book, movie, or other form of media.
Well, it depends on how you define 'good'. Trevor Story has shown flashes of brilliance, but his consistency can be a bit up and down. However, when he's on his game, he can be a real force to be reckoned with.
The suit made McDonald's more aware of coffee - related safety issues. They probably started to be more careful about the temperature at which they serve coffee.
It made McDonald's more cautious about the temperature of their coffee. They likely changed some of their procedures regarding coffee serving temperature to avoid similar lawsuits in the future.
Yes, there are. Some versions might focus on him being a haunted figure, like his spirit being trapped in an abandoned McDonald's. Others could be about him being a creation of some dark magic that has gone wrong. Each version adds its own unique twist to the scariness.
As far as public knowledge goes, no. Trevor Noah has been occupied with things like touring for his stand - up comedy, his work in television and digital media. He may be interested in writing a novel in the future, but there are no signs of it at the moment. He might be more focused on his current platforms where he can reach a large audience and express his views on various topics, from politics to social issues.