Lactopia's Expressive Tail
This animated bento tail fatpack includes 25 different animations spread out over nine different moods. For example, you can change your tail's "mood" from "Pleased" to "Angry" with a single click on the HUD. Each mood plays three different animation, determined randomly. If you're happy with the mood it's in, you can detach the HUD once you've set it. On attachment, the mood defaults to "Relaxed."
Additionally, this pack includes enormous visual variety. For each of the four patterns (Black, White, Black & White, and White & Black), there are 3 different lengths, Short, Medium, and Long.