Ohhh from So. Cal ...Infest's Slave LP, power violence pioneers. Remember that scene from Walking Dead where Negan wacks Glen upside the head with Lucille? That's what this album sounds like....it's as if there was a sudden cage match in a preschool.. sick af
Hmmm, Eluveitie, Black Kirin, Bathory, apocalyptica maybe? That should cover some range for you to try different things (although they are not obscure either). Demetori is really cool imo; but it's doujin so """amateurish""", and specifically around Touhou fanbase.
For rock... 珂拉琪 Collage, there's a Light, Toe, DSPS, MASS OF FERMENTING DREGS, a picture of her, Itsue... Those are more post rock, experimental, shoegaze, math rock though