Tons in TCW. Some of which that had over half a dozen episodes where they themselves were the protagonist.
Star Wars is indeed a hero's journey, but it also isn't afraid of mature storytelling that acknowledges that bad stuff, VERY bad stuff, can happen to good people.
Also you need to stop treating the cartoons as exceptional from the movies. Lucas didn't want that, and that's why TCW wasn't like that. So if we include the movies we also have characters like Qui-Gone and Obi-Wan.
And lets not forget Anakin Skywalker, the main protagonist of the prequels, and what happened to him. Yes, it is a very bold thing, a huge risk, to break conventions in such a way, to NOT have your protagonist come out on top and live happily ever after in a fantasy series. But it can happen. It's not impossible, it's not unheard of, and I don't believe it's off limits.
Good people die, it's a important part of storytelling for kids, VERY important, and Lucasfilm know this.
Good people will continue to die in the movies, and the books, and the comics, and yes even the cartoons. I fully expect Kanan to die, and if they come up with a meaningful story that entails Ezra's death, Ezra would die too. It's not as controversial as you are making it out to be, especially when Ezra isn't even a child anymore. The show is wrapping up so they don't even have the future of the show at stakes. Filoni has said that he has had the Rebels ending planned from the very beginning, so whatever happens, it's been decided for about 5 years now anyways.
Do I personally think Ezra will die? No, the show is leading up to A New Hope, and "hope" is the keyword there. But if Lucasfilm wanted to tell a story of Ezra's death, it could happen.