Kaomoji represents Japanese words and the face of the Japanese people through a letter. It is not at all like the western kaomoji which you are seeing next to it :) which looks like this now you must have understood and Japanese Kaomoji is a very big category which is in a lot of categories and which Lenny face is, it is definitely used to use the bracket to show the face of the person additionally. So now you have understood the difference between kaomoji vs Lenny's face