I can read these mangas many times! I rate them >9.5/10 based on my own preferences, so there will be lots of non-mainstream BL
Genres: NO PWP, no doujinshi
Length: <100 chapters or 3 vols
Search by tags: http://www.mangago.me/home/people/12706/manga/1/
If you like this list, please click "RECOMMEND". Thank you XD
2nd list: http://www.mangago.me/home/mangalist/655038/
3rd list: https://www.mangago.me/home/mangalist/3746699/
(IF 1ST LIST IS FULL, I'LL MOVE OLDER ONES TO MY LIST 2&3)
I WRITE MY OWN DESCRIPTION.
Hybrid - half human, half animal
Beast - twice or thrice the human size
Monster - fantasy, myth (vamp, demon, god, zombie, etc.)
Note: some are Supernatural/Scifi - robot, alien, use of magic, etc.
MORE OF THIS?
!! Hybrid/Beast/Monster (2) !!
https://www.mangago.me/home/mangalist/1291017/
!! Omegaverse !!
http://www.mangago.me/home/mangalist/433411/
!! Hybrid/Beast/Monster Shounen Ai !!
http://www.mangago.me/home/mangalist/433568/