This Godot addon includes some common emotion expression icon animations, which are generally used in dialogue or anywhere you want.
Sprites and pre-made SpriteFrames are included.
All the images come from スタジオデムサト, who generously released these for free on booth. You can also see a preview of all the animations there.
The original images are too large for common game development in both size and resolution, so I've scaled them down to 20%. If you need higher-resolution images, feel free to download them from booth and replace them in the assets folder.
The license for all images in the assets folder is in the readme.txt.
(portrait is not included.)