Kylo Ren

Kylo Ren, originally born as Ben Solo, is the central villain of the Star Wars sequel trilogy. He appears as the main antagonist of the first two installments, The Force Awakens and The Last Jedi; and he progressively becomes the deuteragonist of the third and final installment, The Rise of Skywalker.

He is also the overarching antagonist of the second and final season of the animated television series Star Wars Resistance.

Star Wars Resistance
According to Kel and Eila, Kylo Ren arrived on Tehar with the First Order, where they massacred everyone. The children witnessed Kylo Ren wielding a lightsaber that they've heard in the stories about the Jedi.

After Kazuda saved Kel and Elia from being taken by the First Order, he reported to the Resistance about Kylo Ren's massacre on Tehar.