There was no Shadow Kirby in Kirby 64. The Shadow Kirby
appearances are:
Kirby and The Amazing Mirror: Shadow Kirby was an enemy.
Kirby Squeak Squad: Kirby could spray-paint himself to look like
Shadow Kirby.
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Crash kirby
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Kirby, Meta Knight, Galactic Knight, Keeby*, Shadow Kirby, Red
Kirby, Green Kirby, Blue Kirby,Marx** *Keeby=Yellow Kirby **Marx
May be an altered Kirby.