Yes, Darth Revan did fight against Darth Nihilus. In the video game "Star Wars: Knights of the Old Republic II - The Sith Lords," Revan and Nihilus are both prominent characters. They come into conflict as part of the game's storyline, with Revan ultimately facing off against Nihilus in a climactic battle. Their confrontation is a significant moment in the game's narrative and adds to the lore of the Star Wars universe. **

According to canon, Darth Sidious is considered to be stronger than Darth Vader. As the Dark Lord of the Sith, Sidious was a master of the dark side of the Force and was able to manipulate and control it to a greater extent than Vader. Sidious was also able to defeat Vader in combat and ultimately overpowered him, solidifying his position as the more powerful Sith Lord. **

Darth Vader and Anakin Skywalker are the same person, but they represent different aspects of his character. Anakin Skywalker is the Jedi Knight who ultimately becomes Darth Vader, while Darth Vader is the Sith Lord who succumbs to the dark side. Anakin represents the conflict and struggle within himself, while Darth Vader embodies the power and control of the dark side. Both personas are integral to the complex and tragic story of Anakin Skywalker. **

Darth Nihilus is a character in the Star Wars expanded universe, specifically in the video game "Star Wars: Knights of the Old Republic II – The Sith Lords." He is a Sith Lord who is known for his insatiable hunger for the Force, which led him to consume entire planets and their inhabitants. Nihilus is depicted as a dark and enigmatic figure, shrouded in a tattered robe and a mask that hides his true appearance. His power and presence make him a formidable and terrifying antagonist in the Star Wars universe. **

Darth Vader's armor does provide him with physical strength and protection, but his true power lies in his connection to the Force. Even without his armor, Vader's mastery of the dark side and his skills as a Sith Lord would still make him a formidable opponent. However, Darth Sidious is considered one of the most powerful Sith Lords in history, so it is likely that he would still be more powerful than Vader even without his armor. **

Darth Vader is not typically considered an antihero. An antihero is a protagonist who lacks traditional heroic qualities and may even have some villainous traits, but ultimately acts for the greater good. Darth Vader, on the other hand, starts as a villain in the original Star Wars trilogy, serving as the main antagonist. While he does experience a redemption arc in the end, his actions throughout most of the series are more aligned with a traditional villain rather than an antihero. **

Yes, Darth Vader is dead. In the Star Wars universe, Darth Vader dies in the film "Return of the Jedi" when he sacrifices himself to save his son, Luke Skywalker, by killing Emperor Palpatine. This act of redemption marks the end of Darth Vader's life and his return to the light side of the Force. While there have been various spin-off stories and expanded universe content, in the official canon, Darth Vader's death is a definitive event. **

Darth Vader is known for his iconic line, "I am your father," which he reveals to Luke Skywalker in "Star Wars: Episode V - The Empire Strikes Back." He also frequently uses the phrase "I find your lack of faith disturbing" to intimidate and assert his power over others. Additionally, Darth Vader is known for his heavy breathing and mechanical voice, which adds to his menacing presence in the Star Wars franchise. **