The extreme, rubber-band expressions of BFDI (specifically the "zoom-in" shocked face or the "angry thick eyebrow") have become reaction memes on Discord, Twitter, and Reddit. People want transparent PNGs of just "Leafy's happy face" or "Firey's scream" to paste onto other images.
BFDI assets are vector-based. This means they are mathematical paths rather than pixels. bfdi faces assets
Animators Jacknjellify (Michael and Cary Huang) built a massive library of reusable assets. Instead of drawing a "surprised face" from scratch every time Firey gets scared, they use a pre-existing asset from the library. This workflow is what allowed a small team to produce consistent weekly episodes for years. This means they are mathematical paths rather than pixels
The Battle for Dream Island Fandom Wiki is the gold standard. Most character pages include a "Gallery" section dedicated to expression sheets. While these are often screenshots from the show rather than raw PNG assets, they serve as excellent tracing templates. This workflow is what allowed a small team