"Forgive me. I feel it again... the call from light. Supreme Leader senses it. Show me again the power of the darkness, and I'll let nothing stand in our way. Show me, grandfather, and I will finish what you started."
The main villain of Star Wars Episode 7: The Force Awakens, Ben Solo (son of Han Solo and General Leia Organa) used to be one of Luke Skywalker's Jedi apprentices until he turned to the Dark Side of the Force, and took up the name Kylo Ren.
He now serves the First Order (the remnants of the Empire), under the guidance of the mysterious dark lord Supreme Leader Snoke. Kylo Ren is part of the Knights of Ren, a group of corrupted former Jedi students who also follow Snoke.
Kylo Ren idolizes his grandfather, Darth Vader, for the atrocities he committed when he was a Sith. He even went so far as to construct a little "shrine" of sorts, containing Vader's burned helmet.
His signature weapon is an unusual lightsabre. The crystal that powers the weapon is cracked and unstable, so the handle has two exhaust ports for lasers/plasma that also double up as crossguards. In addition to this, he is of course a skilled Force user, able to both remotely choke his enemies, and probe their minds.
That being said, Kylo Ren is still a novice, currently lacking the extensive training of most Jedi and Sith seen in the previous Star Wars films. He is also shown to have an explosively awful temper, going berserk with his lightsabre on nearby objects when things don't go his way.
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