In a studio setting, effects like these are usually managed by the 2D or post-production team. Since Hotaru is an indie solo creator, they put together their own collection of various emotions in Maya that can be used for almost any scenario, and it's completely free.
Hotaru created Emo Eff Rig as part of their indie film project and will be updating it during production. However, these updates will be available exclusively to those who have purchased the paid version. You can get Emo Eff Rig by clicking this link.
