Aizo
Banned
Surely you already know Maximum the Hormone? Their new stuff is still good. Here's another (stick with it).Can someone recommend a really heavy band for me?
Sigh
Vampillia (best band I've ever seen live)
Amüza
(old) Blood Stain Child sounded like Children of Bodom, but I didn't really like them from 2005~2012. They sounded a lot like Fear, and Loathing in Las Vegas. Now, they have a new female singer, and they sound like this.
Dazzle Vision
If you like Power Metal, I can give you tons of recommendations, too. I can also give you lots of Visual Kei recs.