Can one sue for "Defamation of Character" if it can be demonstrably PROVEN you have no character? What's the legal definition of character?

This is a quick summary, under Oregon law:
https://kellywarnerlaw.com/oregon-defamation-laws/

Defamation is defined as a false statement communicated to another person that damages your reputation.
If you are a famous person, it has to also be malicious.


Here's a quick summary of the federal laws:
https://kellywarnerlaw.com/us-defamation-laws/



In 1735 a journalist (John Peter Zenger) in the colony of New York was acquitted by a jury who nullified a law making it a crime to criticize public officials (defamation).  So even though it violated the law, the jury said: "Nope.  You can't make it illegal to say the truth about somebody."