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I agree with phio, I don't believe Rin is a half-demon. It has been explicitly stated several times that he is a demon and has the power to kill Satan (he is a weapon). I believe that he is equally matched in raw power with Satan. Satan has more experience and control over other demons. Rin has creativity that hasn't been dimmed by a thousand years of existence and trust in others.
So I think Rin and Satan will be matched in the end, but his colleagues will be part of the turning point.
I agree with R4N, Rin already has a body of his own in Assiah, he has no need to possess anything in Assiah.
Anya, I think you mean mitosis, not osmosis. I think two demons go at it, they produce offspring - and that's where Mephisto and Amaimon came from. Because they are products of Satan and a lesser demon, they are less powerful and have a totally different set of powers.
what bugs me is that it has been stated previously that there were other children that were the product of both a human mother and a demon father, so besides that rin is probably the strongest of all these children and the fact that he has satan's blue flames, what makes him different then the rest....plus Amaimon said when will rin JOIN satan (and mephisto but were under the impression that amaimon doesn't know mephisto has his own plans in mind) and that implies that rin will willingly join satan. there has to be something to that and maybe it has do with when rin's sword will be broken....
I believe that Mephisto has some back plot for this because well I think that if Rins body grows stronger by training to become an exorcist and possibly to know every thing for exorcist to know since if Rin becomes paladin he will know everything about exorcists and such so if that happens and Satan takes over his body then he would know all the back plans they have againts Satan so yeah it would be playing sure