One of the most effective ways of revealing character is through the character presenting himself in his own words.
If you just write: “He had no problem in spreading lies and innuendos” you know little about your character, but if you use his words, such as Trump’s words about Obama’s birth certificate, you get an immediate impression of the man:
“Who knows about Obama? … Who knows, who knows? Who cares right now?… I have my own theory on Obama. Someday I will write a book, I will do another book, and it will do very successfully.” (taken from an interview with CNN’s Wolf Blitzer on January 6, 2016)