Who is Brandir from Unfinished Tales of Numenor and Middle-earth and what is their importance?

Brandir is the leader of the people of Haleth in "The Tale of the Children of Hurin." Brandir falls in love with Nienor and councils her not to marry Turin. No matter how he feels, Nienor cannot look at him as anything other than a brother. Eventually, Turin kills Brandir.