It is not known for sure what Shinda is, he simply limits himself to say that he is not human because he has lived too long, going so far as to call himself an "old man".

He has always been very generous and kind to everyone, even those who are mean to him, he seems to be the typical man who wouldn't hurt a fly because his warm smile and calm way of speaking usually fills most people with peace, even so, he can be quite aggressive but without being reckless. In addition to this he can take a serious stance that would scare anyone, he also has great strength.
He has shown to have a protective and paternal side towards important people.

Almost nothing is known about his past and he tends to avoid the subject. He only limits himself to saying that he will not waste time telling his story as long as innocent people continue to die at the hands of horrendous creatures.