Klaus
But there was another thing that had made his pupils contract drastically. That was the fact that he could not see any information about this black-haired young man who had appeared.
This was yet another time that he was experiencing something that he had never before. This was the first time that he was getting a human that he could not get information about.
It might be true that this was the first time that he was encountering humans of this world, but who said that in his own world, he had never encountered humans? He had encountered numerous of them, and it was definitely impossible for him to be able to know them just by looking at them using the ability that his race possessed.
One had to understand how overpowered the ability of the merman to be able to look at the information of the others was. Olivia and the others were related to Henry, and for that reason, there was nobody that was capable of seeing the information about them.