http://www.mangago.zone/home/mangalist/213096/
http://www.mangago.zone/home/mangalist/147164/
Check out these lists maybe you'll find sth
Have you read this? I really love this one http://www.mangago.zone/read-manga/ikenai_otoko/
A lot of the comics in this list aren't really mainstream: http://www.mangago.zone/home/mangalist/231872/
PANDORA HEARTS
-mystery, supernatural
Karneval
Supernatural
I'm looking for rly good but not currently mainstream manga, I've read it all