Top 10 Best Star Wars Dark Side Characters that are Not Sith

The Sith are the prime users of the Dark Side of the force in Star Wars. However, there are a few dark side users who were not Sith. Here they are:
The Top Ten
1 Savage Opress Savage Opress Savage Oppress is a fictional character who appeared in the animated series Star Wars: The Clone Wars. Oppress was the secret apprentice and of Count Dooku and brother of Darth Maul. He is voiced by Clancy Brown.
2 Kylo Ren Kylo Ren Kyle Ren, also known as Ben Solo, is a fictional character in the Star Wars franchise. Kylo Ren commands the First Order with a temper as fiery as his unconventional lightsaber. Ren first appeared in 2015's Star Wars Episode VII: The Force Awakens. Ben Solo, the son of Han Solo and Princess Leia, was more.

I knew that there were Dark Side users who were not official Sith but I was kind of surprised that he was one of them.

3 Asajj Ventress Asajj Ventress Asajj Ventress is a fictional character from the Star Wars franchise during the Clone Wars, appearing in the Clone Wars micro-series, and in The Clone Wars film and television series. She is voiced by Nika Futterman.
4 Mother Talzin Mother Talzin
5 The Son
6 Starkiller Starkiller Galen Marek, codenamed Starkiller, was a male Human apprentice of the Sith Lord Darth Vader. A powerful Force-user who lived during the era of the Galactic Empire, Marek originated from the Wookiee home planet of Kashyyyk as the sole offspring of two Jedi Knights—Mallie and Kento Marek—who deserted more.
7 Grand Inquisitor Grand Inquisitor
8 Seventh Sister Seventh Sister
9 Fifth Brother Fifth Brother
10 Trilla Suduri Trilla Suduri
The Contenders
11 Eighth Brother Eighth Brother
12 Ninth Sister Ninth Sister
13 Snoke Snoke Supreme Leader Snoke is a fictional character in the Star Wars franchise. Snoke served as the mysterious leader of the First Order. Supreme Leader Snoke is a CGI character voiced and performed by Andy Serkis.
14 Knights of Ren
15 Merrin Merrin
16 Taron Malicos Taron Malicos
17 Barriss Offee Barriss Offee Barriss Offee is a fictional character in the Star Wars franchise. Offee was a member of the Jedi Order, and served as the Padawan of Luminara Unduli. However, Offee later betrayed the Jedi Order, framing her friend Ahsoka Tano for bombing the Jedi Temple.
18 Pong Krell Pong Krell
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