Responses
"War-ble"
I haven't actually read any of the things you mentioned but since you said inheriting powers from grim reapers of demons, I think this might be something you can read?
tysm!
glad to help!
anything similar to the boy of death and gangnam dokkaebi? something involving mc receiving powers from grim reapers or demons, ty!
http://www.mangago.zone/read-manga/the_boy_of_death/
http://www.mangago.zone/read-manga/gangnam_dokkaebi/