by Mike Krumboltz His enemies and underlings are painfully aware that Darth Vader is highly irritable and prone to bursts of anger. But until now, we don't think anybody knew that the Dark Lord of the Sith may have suffered from borderline personality disorder. According to a popular blog over at CNN , French researchers have concluded that Mr. Vader (aka Anakin Skywalker) has, at various times, exhibited six of the nine criteria for borderline personality disorder.