Even in animation, Star Wars has never had a problem killing off important characters. Most of Domino squad was killed off in the Clone Wars, along with multiple Jedi, Savage Opress and Satine Kryze. However, the death that resonated most was probably Kanan Jarrus' sacrifice on Star Wars Rebels. He used the Force to push his friends out of the way, but in doing so, he had to let an explosion consume him.
The Bad Batch Theory: Tech's Horrific Death Probably Isn't Final
The Bad Batch's Season 2 finale surprised fans with a horrifying death, but there are hints that the character might not be gone for good.