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You should get an award for this question.
The only things I can think of would be:
1. Vanishing footprints: These might be able to be done, conceptually speaking, with a form of smoke asset. The smoke miiight have the ability to linger if that trait is available in the asset.
IF this exists, insert little lights in the floor/on the ground. When the character walks over the lights the character enters then leaves an event trigger box-much the saw way a sound can be triggered when entering a specific area. There might be a way to put a timer on the event trigger/triggered and the footprints, sound, light, etc., end/disappear. A way TO make them slowly disappear might be to stack/place multiple trigger boxes inside each other/stacked on top of each other and set the timers at/to different durations. Then the footprints could sloooowly fade.
2. Sliding textures/floors. Once the character passes through an area an event causes a floor to slide/ascend. The new texture/floor has the permanent footprints on it.