<P> According to other cast members, Driver is a method actor, which meant that he sometimes stayed in character on set as Ren and left his mask on between scenes . Driver explained that his goal was "to forget you're in Star Wars and treat it like any other job that's filled with moments and problems", because from the perspective of the characters living within the film's universe, "Darth Vader is real". </P> <P> Ren's character arc shares similarities with that of the Star Wars expanded universe character Jacen Solo, the son of Han Solo and Princess Leia who threatens the galaxy as a fallen Jedi . Additionally, critics have noted a resemblance between Ren's character design and that of Revan, the protagonist of Knights of the Old Republic . </P> <P> Abrams told Empire in August 2015, "Kylo Ren is not a Sith . He works under Supreme Leader Snoke, who is a powerful figure on the Dark Side of the Force ." Abrams had previously told Entertainment Weekly that the character, "came to the name Kylo Ren when he joined a group called the Knights of Ren ." Robbie Collin of The Telegraph described Ren as "a hot - headed, radicalised Dark Side jihadi, whose red lightsaber splutters and crackles as violently as his temper". Abrams noted, "The lightsaber is something that he built himself, and is as dangerous and as fierce and as ragged as the character ." The Telegraph also explains that Ren's wild and erratic temper and "angsty" instability make him dangerous . Melissa Leon of The Daily Beast describes Ren's use of the Force as "formidable", citing his ability to stop a blaster shot mid-air, immobilize victims and probe their minds against their will . </P> <P> Kasdan told Entertainment Weekly in August 2015, "I've written four Star Wars movies now, and there's never been a character quite like the one that Adam plays . I think you're going to see something that's brand new to the saga," noting that the character is "full of emotion". Abrams explained, "I think that what makes Ren so unique is that he isn't as fully formed as when we meet a character such as Darth Vader...He is not your prototypical mustache - twirling bad guy . He is a little bit more complex than that ." Driver said in December 2015 that, despite the visual similarities to Darth Vader, Ren is "unlike any villain the franchise has seen before". He explained: </P>

Where did the name kylo ren come from