Emily remained quiet for a few moments before she started to speak...
"I personally like the way you smile. It is calming and pleasant to look at." Emily blushed in the end, but she said what she liked about Klaus.
Of course, when it comes to what she truly likes about him, it would be everything about him. Klaus had developed the habit of always smiling, regardless of how daunting something was.
He is always smiling, which lightens the mood.
Maybe it was something he got from his father.
The mad hunter, to the rest of the universe, was one of the most dangerous demigods to walk the face of the universe. Some say he is even more dangerous than most of the paragons when they were demigods.
However, Klaus saw him as a loving father and a best friend. They had so much fun when he was a kid, so maybe, subconsciously, he developed this habit of showing a happy expression when he talks.
