These emojis including it’s eyes, whether or not it has arms, words, or other fancy decorations like stars (☆).

Simple Flat Mouths
( ^_^)／(^ _ ^)/（＾_＾）
(^-^*)/（￣ー￣）(∩_∩)
(∩▂∩)(☆^ー^☆)（ｖ＾＿＾）ｖ
p(＾-＾)q