I've always liked this quirky anime technique, which was used in several anime around the 1990s and 2000s, but not THAT often. What is it called and how does it work?
How do you animate it and when does it get used?
I also found other examples
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I doubt there is an actual name for this but it's likely a trope that derived from older manga works., most notably that of Fujio Akatsuka. It's best described as an "afterimage" of movement.
There are many names for such, like "ghost feet", but there's not any real agree upon terms for this trope.