Neutral B - Massive Inhale
King Dedede's Inhale is larger, stronger, and can pull in opponents and items from a longer distance! Sadly it takes quite a lot out of him, not only making it much easier for opponents to escape but also the end lag would become longer too. Use this move wisely!
(Alternatively) Neutral B - Gaping Mouth
No inhale action here! King Dedede will open his mouth widely for a brief moment waiting for any opponent foolish enough to jump right into it to just be spat back out! Basically acts similar to an counter with doubled damage from the spitting action. King dedede can still swallow items and projectiles, however it leaves him severely open. You better make sure that it's worth it to do so!
Side B - Unstoppable Gordo
A Gordo that keeps bouncing even after it hits an opponent and cannot be knocked back. Bounces normally, but sadly the launch power as well as damage is decreased; however with an unstoppable Gordo you can only imagine the many combos you can do.
(Alternatively) Side B - Gordo Bomb
A Gordo that simply bounces in place no matter how you angle it, but explodes upon impact thus giving a little more damage.
Up B - Soaring Dedede
King Dedede can more easily navigate left or right with this move as well as travel further; however this move deals no damage and stops midway through (as if you pressed up to end it early at peak height) leaving you vulnerable in the air and when you land.
(Alternatively) Up B - Super Heavy Jump
Sacrifices height and mobility for a much stronger jump that hurts anyone he touches during it whether when in the air or landing. Additional bonus is the landing effect has a large quake effect to send opponents upward. The landing lag is also increased.
Down B - Spinning Jet Hammer
While King Dedede may not be able to move while charging this custom, he can move by spinning left or right once the button is released. The spin lasts depending on how charged the hammer is. Takes longer to charge and immediately inflicts self-damage at the start, but at least you have the potential to hit multiple enemies with it in one go! Oh, and try not to get dizzy...
(Alternatively) Down B - Light Jet Hammer
King Dedede can move a little bit faster and jump slightly higher while charging his hammer, but the damage is decreased.
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Welp, I tried and this was the best I could come up with. Hopefully these sound okay!