Board Thread:General Discussion/@comment-4504826-20160516034744/@comment-27620479-20160523045618

If you mean Chara isn't fully a living human, yes, it is correct. They are a dead human.

If you mean Chara isn't fully a dead human with a well preserved body and soul, it is also correct. Their body was poisoned, carried here and there, wrapped in bandage, put into a coffin, and finally buried. It should also show signs of decay, because there is indication that a lot of time has passed since their death. Their soul was absorbed, and they could do with a new one.

If you mean that Chara wasn't fully a human when they were still alive, that is likely incorrect. Monsters recognized them as human without doubt. Also, since they could cross the barrier together, either Chara had to be fully human and Asriel fully monster, or both of them a mix despite the fact that Asriel's parents are both known monsters.