Kylo Ren

Warning: Spoilers may follow.

Kylo Ren (real name Ben Solo), is the tertiary antagonist-turned-antihero in Star Wars: The Force Awakens. He is a first order assasin and was kidnapped by Hux as a child, and then, corrupted to be against the resistance, thus stealing Darth Vader's mask and rebuilding it.

He was portrayed by Adam Driver.

Information
Kylo Ren is a member of the Knights of Ren working for General Hux and Supreme Leader Snoke. The mask that he rebuilt looks very similar to Darth Vader and Darth Revan's mask.

Personality
As one side of him tries to fight darkness and know his family better, he is influenced by darkness as he has killed and betrayed his father Han Solo. However, near the end, he let Rey defeat him, as through her he commited suicide. Since then, his body was burried in Jakku. He seems to love Han Solo, but not have the courage to stand up for him infront of Hux and Snoke.

He has a very tragic, yet obsessive, personality overall.

Physical Description/Appearance
Kylo Ren is a tall, dark and gangly young man. He has broad proportions, including unusually long and thin arms and legs, as well as a large nose and full lips. His hair is black, greasy and approximately chin-length.

While fully clothed, Kylo wears a metal mask the envelopes his whole head, which features ornamental patterns that draw contours around his visor. His mask is designed by him to take inspiration from the late Darth Vader, who Kylo has deep knowledge of. His clothing is black-themed and tailored around his lean physique. The clothing is predominantly made from a soft, flexible material, though his belt and boots are leather-based.

The most distinct physical element of Kylo, however, is his makeshift lightsaber. Its hilt is haphazardly constructed, with it being uneven and with exposed wiring. Its blade is the traditional Dark Side red, though it is shown to be unstable and does not retain the traditional uniformity of a professionally-manufactured lightsaber. Two small crossguard light blades are deployed with ignition of the weapon, giving the lightsaber resemblance to a medieval long sword.

Star Wars Episode VII: The Force Awakens
He at first appeared imprisoning Luke and Po, thus asking them were the map to Luke is. However, he did not know the map was handed to BB-8, who has gone far away on the same planet.

He then witnessed through using his power on Po that the Resistance have the map, however, he sought Po escaping with Finn, and had to report so to Hux.

Then, he asked Hux to find the map for him, but Hux disagreed, telling Snoke about his "bigger plans for a weapon". Kylo however managed to inform Snoke about the new disterbance, as Snoke replied to him that even he is no challange for such a strong Resistance awakening.

Kylo then took Vader's mask, promising not to fail again.

Kylo Ren later went to operate the Resistance Base, and find it's location, so Hux will be able to complete his plans. He captured Rey in the middle of an operation, and took her to his room, tied her up on the couch. However, he tried to redeem himself through reading her thoughts. He told her there is nothing to worry about, and even took off his mask. He tried to discover the map, but the only thing he suceeded is in discovering Han. However, she didn't trust him, which lead him to chase her with the stormtroopers.

Han later came with Rey and Finn to deactivate all generators in the base, so the base will explode and evil will no longer be threatening. Han spotted Kylo Ren, and called him in his old name "Ben". Kylo took off his mask, and almost managed redeeming himself, telling him he is torn to pieces, and that getting promised by Han to set things streight, almost giving him his lightsaber. However, due to corruption caused by Snoke and Hux, he killed Han, as the dark powers have developed in him even more, and he thanked Han for that loving option.

He then battled Finn, calling him a traitor, and Rey, who couldn't stand him anymore fought him with no mercy. During the battle, the Rebels demolished Starkiller Base, causing a huge earthquake. Kylo Ren asked Rey to trust, finally redeeming himself from any evil, and letting her defeat him, thus Ren then was prepared to be killed by her, but a rift went in between them. It is unknown what happens to him after this, but either he fell in the rift to his death and died, as his body got buried in Jakku, or he was rescued by Hux and taken to Snoke, as Snoke said he will finish his training.

Trivia

 * Instead of L.E.G.O. Dimensions, Kylo Ren instead appeared in Disney Infinity, as Star Wars is owned by Walt Disney Pictures, now.
 * He is a Presumed Deceased antagonist, as his final fate is unknown.
 * Kylo Ren has a very tragic personality, allowing him to reform near the end, and making Snoke more evil. However, he still serves as the secondary antagonist (till becoming an antihero near the end) for carrying out his and Hux's actions, becoming the second biggest threat in the entire film.