仮面ライダー: Kamen Rider Ryuga (仮面ライダーリュウガ)

Kamen Rider Ryuga (仮面ライダーリュウガ, Kamen Raidā Ryūga?) is one of the fictional character and the main antagonist in the Kamen Rider Ryuki: Episode Final. He is one of the 13 Kamen Riders the story revolves around. His Rider appearance resembles Kamen Rider Ryuki, but with a black look ripped all over and is similar to Ryuki's Blank Form. Aside from a brief cameo in the TV Special 13 Riders, his only screen appearance was in the movie Episode: Final. He is portrayed by Takamasa Suga.
Dark Shinji Hensin To Kamen Rider Ryuga

In the alternative continuity of Episode Final, Yui Kanzaki had already met and befriended Shinji Kido, Kamen Rider Ryuki, when they were still both very young. As a result, the young and lonely Yui subconsciously created a duplicate of Shinji in the imaginary Mirror World. Several years later, this Shinji clone would adopt the identity of Kamen Rider Ryuga and join the Rider battle in order to pursue his goal of becoming a real person in the real world.
The Mirror World version of Shinji Kido could survive indefinitely in his own universe without any extra protection, but could only stay in the real world for a short time before starting to disintegrate.
Ryuga was occasionally mistaken for Ryuki. Ren had seen Ryuga attack Kamen Rider Femme while out fighting a Hydragoon, and thought Shinji had come to understand the meaning of the Rider War. He then demanded that Shinji fight him. Miho also mistook Ryuga as Shinji when Ryuga saved her before Kamen Rider Ouja could kill her. Ryuga himself had destroyed Genocider and turned Ohja into blank form. Femme then finished Blank Ouja off.
In terms of character, Ryuga was the exact opposite of his real world counterpart. While the real Shinji was kind and innocent, the Mirror World version was cruel and scheming. He was responsible for the death of Kamen Rider Femme, mortally wounding her during their fight. Near the end of movie, he met his own fate at the hands of his real world counterpart when, after a climatic showdown, the two Rider's Final Vents collided, Ryuki surviving while Ryuga perished.

Kamen Rider Ryuga Debut:
(2002)

Gender:	Male
Series:	Kamen Rider Ryuki
Motif:	Black Chinese Dragon
Rider Type:	Villain
Homeworld:	Earth (Ryuki World)
First Appearance:	Kamen Rider Ryuki: The Final Chapter
Last Appearance:	Kamen Rider Ryuki: The Final Chapter
Number of Episode Appearances:	1 (Movie) 1 (Ryuki Special)
Actor:	Takamasa Suga

Height: 1.90m
Weight: 60kg
Punching power: 250 AP (12.5t)
Kicking power: 450 AP (22.5t)
Vision and Hearing: 17 km approx
Maximum Jump Height: 40m
Maximum Running Speed: 80km/h

Being a copy of Ryuki, Ryuga is "balanced" Rider with equally powerful melee and far-range fighting capabilities, he uses his black Black Drag Visor gauntlet on his left forearm to use Advent Cards from summoning his Drag Saber. His Final Vent is Dragon Rider Kick, jumping into the air to emit dark energy that paralyzes the opponent's legs and then deliver a flying side kick with Dragblacker flying behind to boost the attack's power with its dark flame. Apparently, it's not as powerful as Ryuki's, as when the two collided, Ryuki's Final Vent won out and killed Ryuga.