An idea you'll find in non-GM game development suites is static sprites. Mechanistically, they're sprites that you place at a fixed (static) position in the room. Essentially, they are animated tiles. This is 90% UI related, or I'd probably just throw it in without ever writing up a proposal. LGM's tile editor is sad as it stands, and so is ENIGMA's tile implementation (no offense to TGMG, who just wanted something in that worked).
Ideally, they'll be placed at a certain depth using the tile editor. We'd want a way to set their coordinates, animation speed, and maybe scale/rotation.