Buncha psfers who could do with more mention-
Toho Sara
If the idea of improvised Tibetan ritual music appeals to you... Legendary psych luminaries like Asahito Nanjo (High Rise, etc etc) and Kawabata Makoto (Acid Mothers Temple etc etc etc etc) collab with other like-minded speedfreaks to deliver this... ponderous... monstrous... thing. Somewhat dark in flavor, slow moving, very dense, almost orchestral, free flowing but never devolving into random noodling or losing focus or intensity, all via apparent wackload of traditional instrumentation, percussion, bells gongs, strings, winds, organ, harmonium, electronics. Everything I've heard is simply divine, screaming, roaring, raging for reissue.
Tomokawa Kazuki
The "screaming philosopher"- and yes, he really is.
Opening track on his 1975 debut
https://youtu.be/s-GhHQzcRQUMore recent 2009 offering
https://www.youtube.com/watch?v=VouvF0qD9S8Perhaps musically far removed from this forum, until he gets worked up into a frenzy... which is quite often. It may help if one understands what he's on about, but the unhinged passion undeniably comes through. Anything on PSF would be worth checking out. Haino is a big admirer, which may be obvious as the vocal styles tend to overlap. And Haino plays on a couple tracks from Erise No Me PSFD-8008, one of my faves.
Mikami Kan
Another screamer poet. Has recorded with Haino and is the main vocalist in Vajra. There are things in his discog that actually venture into enka, particularly the older stuff released on labels like Victor and Columbia. (Enka might be described as a "Japanese cruelty" along the lines of German shlager, but Mikami Kan's read on the genre single-handedly got me into it!) Once he gets on to PSF there is a marked departure for a more warped blues shores. Overall, I much prefer his varied vocal stylings to the all-out screaming of the above Tomokawa. But they complement each other well, and there are recordings of the two performing together.
One bit of solo venture I personally quite like: Barking Practice///White Lines PSFD-8026
https://www.youtube.com/watch?v=QPrMTIUHwOQSpeaking of Mikami Kan, to the person or persons who recommended Vajra, my infinite thanks! This is a project that grabbed me by the throat from note one... and... erk... never... ugh... let... ack... go. Phew. The live recordings can be elevating, but studio recordings like Mandala Cat Last (PSFD-129) have some very interesting textures and turns.
Will need to come back with a few more mentions.