Also, on Star Wars: High Republic Adventures #1, there's a nice 10 page sample in the High Republic Sampler over at Disney.com:
https://books.disney.com/book/the-high-republic-free-digital-sampler/
Tons of first appearances (more than the Marvel book even), including the Nihil Raiders (I think someone said this before), the main antagonists from the book. If Marchion Ro shows up, this book will go wild. It doesn't read like an all ages book, more like a compliment to the Marvel series. I think this one is being slept on.