Hiii. I wanted to study how did you do to make the portraits change using tags for my own project but for some reason when I use the tag the same way you did to change the sprite to a different emote ("[#expression]") using the same name I put on the animation player it returns null on the function that should update the tags and the game crashes.
I have a first playtesting session with some friends to see if the project is worth pursuing further or I should start again and likely will use this project specifically as a starting point.
Worth noting, in my case is a visual novel and there's usually 2-3 characters on the screen at the same time. So idk if the syntax should be different.