Shadow Kirby makes an appearance in two Kirby games: throughout the stages of Kirby and the Amazing Mirror, and as the final boss of Kirby Fighters, a sub game in Kirby: Triple Deluxe. However, though they share the same name, the two look very different, (the KatAM version looking like Kirby, but gray and with black eyes, and the KTD version looking like Kirby, except with white eyes and sort of a swirling vortex for a body), and it is unclear if they are actually the same person.
P.S.- I couldn't find any good comparison photos, so instead, here's some awesome KatAM fanart! (The Shadow Kirby in the fanart is the KTD version).
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Random Kirby Facts
Non-FictionA book of facts from the Kirby franchise. Facts from both the video games and the anime will be found here. DISCLAIMER: I do not own any of Kirby's characters, locations, plot lines, all that. All credit goes to Nintendo. Also spoilers.