[quote=@BKburke][@ArenaSnow]

But that was just it. Astirother has no magic. They only thing that identifies him as a demon is his physical appearance and physical abilities. He literally can't develop magic. It was in my cs. His body can not manifest magic. Which is why I believed the ring would have done a good job, all the ring does ishe make his physically weaker. His neckalce doesn't have to cloak anything but his physical form. He has no aura or magic. He is literally a pure physical character.
[/quote]

Being 100% unassociated with magic while still being a demon, my canon's lengthy argument against such an occurrence aside as it's not relevant here, still leaves the ring and the amulet's ability to manipulate him. The ring itself would carry suspicious magical properties as a result of being able to hold back his physical prowess - either he has the prowess still and it is deeply tucked away within him, or the ring modifies/contains it. There's more I could go into on this area, but then I'd shoot myself in the foot as I hate getting too technical ;p

The amulet, similar to the ring, must be rather powerful to physically manipulate him, and even then it wouldn't 100% change him to one thing or another unless the ring was extremely powerful which would be a giveaway in and of itself to those aware. Demons have different physical compositions than humans; it's rather like turning a cow into a chicken from where I'm seeing it.

The CS also makes mention of a demonic aura to those properly equipped to sense it - [quote]He wears a necklace that allows him to take human form though this does not hide [b]his demonic aura[/b] from holy figures trained to sense it.[/quote] - And I don't think it would be too much of a stretch for individuals who spend time around illusion or demons that utilize similar tools or are demons themselves to be able to notice.

What Tony has right now is merely a suspicion, and there's presently no way for one of the mortal characters - save, perhaps, Alionna - to be able to prove anything or to go beyond a mere suspicion. Given the presence of other demons already, Tony would be right to have a bit of paranoia when dealing with the group. Your character's task seems to me is to prove himself worthy of the trust in such an unreliable setting.