Again, "Itou-san" is the only one that's really known of. I can think of one where the guy opens his eyes very rarely, but most of the time has them closed. Otherwise there isn't anything we can find.
Try Suzuki Tsuta, I think she has few characters like that but I don't know which stories exactly.
Bu I might be like really wrong ╮(￣▽￣)╭
Bleach DJ with Gin as a character
He opens'em pretty often but for the most part http://www.mangago.zone/read-manga/kami_sama_no_iutoori_moegi_yuu/
Ok thank
Thanks for the responses
Looking for yaoi manga where one of the main characters (either seme or uke) always has his eyes closed, a.k.a. "Squinty eyes"
Example: this cute little puppy ε=ε=(ノ≧∇≦)ノ
http://www.mangago.zone/read-manga/kare_no_tokubetsu_na_kare/mf/manga/kare_no_tokubetsu_na_kare/c005.2/pg-6/
Please and thanks! ლ(´ڡ`ლ