Why Kylo Ren Has A Red Lightsaber, Even Though He Isn't A Sith

[هَـ-ђāŵĩ-ـَاوِيتم التحقق من هَـ-ђāŵĩ-ـَاوِي كعضو.]

The villains of Star Wars are often accompanied by red lightsabers, which is normally the sign of a Sith – but Kylo Ren is not a Sith, despite wielding an iconic red lightsaber. Ever since the original Star Wars film, this color lightsaber has been largely associated with evil. Sith like Darth Vader, Maul, Count Dooku, and even the Emperor himself, all wield these deadly red blades. But the secret to creating one is not strictly a Sith one.
Daniel Tinaglia

Why Kylo Ren Has A Red Lightsaber, Even Though He Isn't A Sith

How and why Star Wars gave Kylo Ren a red lightsaber.

screenrant.com