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This piece of concept art from Kirby Planet Robobot shows King Dedede and Bandana Waddle Dee as side characters.
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In Kirby Star Allies, there exists an unused and unfinished state named "StateSummonHelper" which creates a Helper in a way similar to Kirby Super Star. It's split into two parts: one that dims the screen, and one that creates the Helper, though Kirby's Ability isn't cleared.
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Kirby has voice lines in Air Ride. Unfortunately they were muted to 0 and cannot be heard in game. twitter.com/container12345…
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There is only one Squishy in Kirby and The Amazing Mirror. It never appears anywhere else but here.
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An Unused death pause screen title card from Kirby and The Amazing Mirror's 2003 demo. it states
"Escaped (dead)
I knew it was impossible..
Something came out"
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The enemy "Dale" only appears in Kirby Air Ride. Despite never appearing in any other game after that, he was present in Kirby GCN.
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Kirby Mass Attack was originally going to feature Blipper as an enemy. Attached below is the single sprite that remains in the game.
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A Japanese Prototype for Kirby and the Amazing Mirror includes leftover art and references to a removed enemy which was labeled トッコーン (Tokkōn) in the prototype's health bar data entries.
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Kirby Super Star's Japanese pause screen text for the Hammer ability implies Kirby's hammer wielding skills were taught to him by Dedede. See below: twitter.com/Dededaio/statu…
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In the Japanese version of Kirby's Dreamland 3. The Boss Butch has a extra title that says "Nintendo 16" refrencing the Nintendo 64. However this is not present in the North American release.
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Early Kirby 64 screenshots appear to have King Dedede, Adeleine and Waddle Dee as playable characters at one point during development but was unfortunately cut from the final release.
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Kirby's Adventure has a particularly difficult puzzle room that was cut from the game. It is cleared by doing this:
Hit the stake with stone/hammer -> ditch the ability and inhale Laser Ball to earn laser before it's destroyed -> shoot the laser at the slope -> enter the cannon.
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The Japanese version of Kirby's Dream Course has a special intro that the other versions unfortunately don't include.
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Despite being removed from Fire's moveset after Kirby's Return to Dream Land, Spinning Fire Breath is fully programmed and finished in Kirby Planet Robobot, but goes completely unused. The move can be re-enabled by changing only 1 byte in the game's code.
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A lost Kirby game which used the connection between the gameboy advance and gamecube for gameplay. Demonstrated here by Satoru Iwata, we see how the gameplay shifts between the two platforms.
"Game over? No! Not even close!"
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Development screenshot of Kirby Super Star. Game was being developed on the famicon for internal testing.
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Cool concept art for Kirby's Dream Land. Kirby was originally supposed to basically vomit instead of spitting out stars.
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High quality footage of Kirby Air Ride from when it was planned for the Nintendo 64. (Ripped by @hard4games)
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