The Change series by Rachel Manija Brown and Sherwood Smith is my favorite YA fantasy.
By "fantasy" I mean post-apocalyptic western with mutant superpowers :D
This series does diversity right. It's part of the setting. The story also features a very cute throuple, a demisexual main character, and realistic depiction of PTSD. And yes, it's well written and exciting. Final book out in October.