Emperor Revan

In an alternate world from typically conceived 'canon', Revan was a Jedi Knight-turned-Sith Lord after the Mandalorian Wars. One of the greatest warriors from the Old Republic, it was no surprise Revan usurped the Republic as quickly as he defended it. While his reasonings were never clear to anyone but himself and his apprentice, Darth Malak, many speculated the war had changed him.

Rendered amnesiac by the Jedi Council at the Dantooine Enclave, Revan lived as a Republic Soldier named Avern for some time before his identity was revealed to him. The shock of the real brought the Sith Lord back to the dark path, leading to him taking his title as Sith Lord back and defeating Malak as the true Dark Lord of the Sith, and eventual Emperor of the Galaxy.

The Star Forge
The Sith Emperor's beginnings in the multiverse were quick. Moments before confronting the Sith Emperor Vitiate in his own time, the merge struck. The Dark Lord was once more on the Star Forge, in front of himself. Contemplating his own options, he was without his Empire and alone. He decided, in his own search for power and knowledge, to take advantage of this strange encounter.

Confronting a Sith Lord
It wasn't long before the Sith Emperor confronted the Dark Lord Revan, an alternate version of himself, to a duel. While not officially, the two had a brief duel. Revan quickly used force drain on his opponent, essentially draining the power from his other self and building his own power.

In a last ditch effort, the weak Sith Lord used the remaining power to muster force lightning at the Emperor, whom utilized the tutaminis ability to absorb the lightning, channeling it into his own attack, striking the Sith Lord into a pile of dust.

The Dark Council
In reacquainting himself with his Empire, the Emperor eventually searched for allies. While the previous Dark Lord did some for him, he was still in search of powerful force users tapping into the dark side, or those susceptible to his manipulation and garnering loyalty from it.

Vyl on Endor
The Sith Lord's search eventually took him to the forest moon of Endor, where he met a small hermit, who promised to show the Sith Lord who he sought. Ignoring his initial suspicions, Revan complied, and travelled to the alien's hut out of curiosity. He eventually deduced the alien had been toying with him, and he was the one he was searching for.

Revan proposed the deal to the Sith Lord, Darth Vyl, and Vyl agreed to join his Empire under the Sphere of Sith Doctrine. Despite this, Vyl warned Revan that if his Empire would ever take a turn for the worse, he would leave without hesitation. Revan agreed to this, pleased with the powerful ally he'd gained.

Personality
Similar to the Revan of the typical timeline, the Sith Emperor is a charismatic and talented leader. The Sith Lord has proved time and time again his sharp ability to lead his own troops, as well as controlling an Empire. In the end, Revan retained some wit and comedic timing from his short time as Avern, although typically only in the presence of a trusted individual, typically Bastila Shan.

Darth Vyl
Lord Vyl is held in respect from the Emperor, a rare gift from Revan. The Sith Lord was able to convince the hermit to join his cause with a seat on the Dark Council. Certainly not a friend, Revan considers the alliance a trusted one if he were to require assistance.

Powers

 * Force Lightning: Revan is extremely proficient in force lightning, even being able to turn Darth Nyriss into dust after years of captivity and torture by the first Sith Emperor.
 * Comprehend Language: Revan holds an ability few force wielders have; comprehend language. It's been said Revan learning a language from a native speaker is like 'ripping the words from your mind', by the Rakata of Lehon. This contrasts Luke Skywalker, and other's same ability.
 * Telekinesis: Revan, like many Jedi Masters and Sith Lords, was a master of utilizing the force to manipulate his environment. Be it moving a crate, or throwing someone against the wall, he is extremely skilled.
 * Force Echo/Psychometry: After gaining amnesia at the hands of the Jedi Council (in canon), touching his mask from the Mandalorian Wars gave him all his previous memories back with a simple touch.
 * Force Sense: By 3954 BBY, Revan believed he could sense the Jedi General Meetra Surik across the galaxy just from her presence. Despite this, her severing of the force prevented this.
 * Farsight/Force Visions: By touching the Star Forge maps after his amnesia, Revan would be greeted by flashes of moments in his life, visions brought on by the force.
 * Force Heal: It has been said that Revan is able to heal himself mid-battle, from using his own force energy, or even utilizing other's for his own gain.
 * Force Slow: Revan is able to trigger stasis in others with the force, freezing their bodies and minds in place.
 * Force Scream: Revan learned this power sometime during his search for the Star Forge while struck with amnesia.
 * Force Fear: Revan, in canon, amplified soldier's fears while under force-suppressant drugs, and even augmented Vitiate's fear of death while in stasis.
 * Thought Bomb: During Revan's time in the Unknown Regions after the Mandalorian Wars, Revan discovered the ancient ritual from Vitiate's own usage of it, during the Ritual of Nathema.
 * Precognition: During the Jedi Civil War, Revan showed off the ability to predict other's attacks and moves (a danger sense). This was shown off during his extreme skill when dispatching Echani warriors.

Abilities

 * Multilingualism: Revan can speak several languages, including: native Basic, Mando'a, Binary, Huttese, Shyriiwook, the language of the Selkath and the ancient Sith. He also holds an understanding of the Rakatans, allowing him to understand what they may be saying.
 * Skilled Strategist and Tactician: Revan single-handedly turned the tide of the Mandalorian Wars alongside his Revanchists, turning a losing battle for the Republic into a large victory.
 * Skilled Mechanic: Revan constructed the assassin droid 'HK-47' sometime during his time before the Multiverse's merging, although it didn't accompany him to his travel into the Multiverse.
 * Skilled Pilot: Revan is able to pilot fighter ships, swoop bikes, and even larger ships, including his own; the Ebon Hawk.

Equipment

 * Revan's Sith (Formerly Jedi) Lightsaber: The saber Revan constructed during his re-training as Avern, Revan eventually visited Yavin IV during his search for the Star Forge, and met Suvam Tan. He purchased the Mantle of the Force from Tan, a powerful cyan saber crystal Revan later bled following his defeat over Malak.
 * Revan's Spare Lightsaber: A second saber Revan looted from a Mandalorian Rally Master named Sherruk. Revan initially used the blue blade within the saber, but opted to used a purple crystal he later found in an urn on Korriban, in the tomb of the Sith Lord Tulak Hord.
 * Revan's Beskar Mask: A Mandalorian mask Revan found during the Mandalorian Wars on Cathar, he vowed to never take the mask off until after the Mandalorian's defeat. Even after their defeat, he continued to use it. Revan eventually lost the mask before finding it alongside Bastila Shan on Dantooine, during their duel with Vima Sunrider.