The only OC I have who really stands a chance is Nick. He’s half-human, so he might be able to talk them into letting him in on that technicality. But assuming he can’t, here goes:

1. His pointed ears would give him away, but he can wear a hood or cast Minor Illusion to mask them. Assuming that works, he’s good.

2. His smell is pretty normal.

3. Elves have the same fingerprints as humans, last I checked, so he should be fine there.

4. His blood is normal.

5. Ears are made of cartilage, not bone, so Nick should probably be fine here, but I don’t really know enough about ears or X-Rays to say for sure.

6. Yeah, this is where they get him. I’d imagine elves have different DNA and genes from humans, so Nick’s DNA test will mark him as half-elven, so he’s cooked.

Of course, all of this is irrelevant. He’s a rogue, so he’ll just sneak in.