I'm actually composing my own music for my comic.. whenever it comes out. I plan on making themed around spacey moody ambient music, traditional Japanese music, and my take on metal, and maybe having them all collide in the climactic fight. Here's a shameless plug lol you can check it out here.
But if someone else had to work on it.. I'd pick Yuki Hayashi and Yutaka Yamada to do the music for it, No question about it. I absolutely love their work on My Hero Academia and Tokyo Ghoul as well as the Bleach (2018 live-action film)
So.. yeah, I think a soundtrack made from both of them working together would sound amazing for that hypothetical animation! 