Kylo Ren is a prominent antagonist in Star Wars: The Force Awakens.
Kylo Ren (born Ben Solo) is the son of Han Solo and Leia Organa. When he was found to have an affinity for the Force, they sent him to Luke Skywalker for training as a Jedi. At an unknown point in his training, he became intrigued with the Dark Side and his grandfather, Darth Vader. He betrayed Luke and the other Jedi students and left to join the First Order.
In the First Order, he became a student of Supreme Leader Snoke and became the leader of the Knights of Ren, which appears to be an order of Dark Side practitioners that has rejected at least some of the tenets of the Sith.
Kylo Ren idolizes Darth Vader and seeks to become as powerful and feared as the deceased Sith Lord. He is impatient and prone to throwing destructive tantrums when events don't go to his liking.
Kylo Ren appears to have exceptional aptitude for telekinesis and telepathy, being able to incapacitate opponents with telekinesis (if there are no other threats) and force enemies to reveal closely guarded secrets via telepathy. His lightsaber combat skills appear to be relatively undeveloped.
Kylo Ren wears body armor, black robes, and a helmet. These appear to be largely affectations meant to emulate Darth Vader, although the armor may have helped him survive a direct hit from a wookiee bowcaster.
Kylo Ren wields a red lightsaber with what appears to be a "laser crossguard". Secondary sources indicate that the primary purpose of the cross-piece is to vent plasma from an unstable blade, not to assist in parrying lightsaber attacks. Nonetheless, the "crossguard" is energetic enough to burn flesh if it makes contact.