Poker face

http://www.mangago.zone/read-manga/kono_ore_ga_omae_nanka_suki_na_wakenai/
http://www.mangago.zone/read-manga/karada_meate_de_warui_ka/
http://www.mangago.zone/read-manga/sayonara_itoshi_no_my_friend/
http://www.mangago.zone/read-manga/virgin_star/ only in rl not while acting
http://www.mangago.zone/read-manga/ten_count/
http://www.mangago.zone/read-manga/bukiyou_na_silent/

Expressionless characters : http://www.mangago.zone/tag/expressionless%20/

Also here is my tag for Indifferent characters it might not be exactly what you want tho
(〜￣△￣)〜
http://www.mangago.zone/people/tag/69120/Ideal/

Thank you ^^

Thank you very much ^^

you`re welcome