Final answer:
The formal revision of the informal sentence about Heracles is 'Hercules shows important character traits, such as strength and courage,' as it presents a professional tone and excludes colloquial language.
Step-by-step explanation:
The sentence that is a formal revision of the informal example sentence "In my opinion, Hercules is pretty much the best character because he shows more strength and courage than any other mortal man" is: Hercules shows important character traits, such as strength and courage. This revision maintains a professional tone and removes colloquial language such as "pretty much" and "because he's stronger and more courageous than other mortals," which is present in the informal version. Instead, the focus is placed on the character traits of Hercules, providing a clear and concise formal statement.