Namek
...while the others were talking to the woman that literally just came crashing in through the ceiling, in a distant part of the library a man dropped into space within the library, no flash no dimensional distubances, he simply appeared and started walking around for a bit as if it was the most natural thing to do ever...
...he scratched his chin apparently remembering something...
"Oh, yeah, library AI, I would prefer if you´d not announce my appearance here, or we might run into some issues, which would be...unfortunate."
...he had two pairs of feathered wings, the wings on the left side were jetblack, the other side pure white, he wore a long trenchcoat with entertwined black and white patterns on it, he had medium-length sliver hair, his left eye had a golden iris the right one was silver and from the looks he was about 22... though he looked rather out of place even without considering he just defied a large variety of physical laws...