Inhale is Kirby's neutral special move attack in all three of his incarnations in the Super Smash Bros. series, though it was previously called Vacuum in Super Smash Bros. and Swallow in Super Smash Bros. Melee. When the special move button is pressed, Kirby opens his mouth and begins to inhale, creating a vortex of wind. Kirby will not stop inhaling until the button is released. If a character comes near the vortex, they will automatically be sucked inside Kirby, who will bloat up with the person inside of him. He cannot move in Super Smash Bros., while in Melee and Brawl, he will move at extremely slow speeds and jump a short distance. Increased weight causes Kirby to fall faster as well. The goal of the attack is to swallow the victim (by pressing down or the special move button), which will make Kirby copy their powers, enabling him to perform that character's neutral special move (the character pops out after being swallowed and can still perform their neutral special attack). If Kirby traps the wrong character in his mouth, or simply doesn't want the character's move, Kirby can spit the character out by pressing the attack button and it has set knockback. Any player who is hit by the character that was spit by Kirby will take damage and decent vertical knockback.
Kirby has a unique hat depending on who was inhaled, such as wearing Mario's hat if he swallows Mario. The copied special attack will sometimes be lost if Kirby is attacked enough, is KO'd, or if he decides to discard it by taunting. Inhaling another Kirby and copying will do nothing unless the other Kirby has already copied an attack and is wearing a hat. If a Kirby is wearing a hat, another Kirby is able to steal it for themselves.
 Swallowing Items
Just like King Dedede's Inhale and Wario's Chomp, Kirby can swallow items using the attack. Any item meant to be eaten will have the same effect (such as Food). However, Kirby can eat any item on the screen. Kirby will automatically swallow the item when it is in his mouth, meaning he can keep other characters from using it. Poké Balls, Mr. Saturn and other "live" items cannot be swallowed. If Kirby inhales large items such as a crate, Kirby cannot move nor attack until it is fully swallowed and it will take some time to digest the item. If Kirby inhales an explosive such as a Bob-omb, he will receive 5% damage.
 Copy Abilities
 Inhaling other Kirbys
When a Kirby attempts to copy another Kirby that has no copied ability, the swallowed Kirby will pop out the same way as normal; however, it makes a different sound and the swallowing Kirby doesn't receive a copied ability.
If a Kirby swallows a Kirby with a copied ability, then the swallowing Kirby copies the power, as well removing the ability from that Kirby.
 "Kirbycide" Applications
In Super Smash Bros. Melee and Super Smash Bros. Brawl, Kirby is capable of slowly walking around the stage while carrying opponents in his mouth, or swallowing a foe while slightly off-stage. This allows for some forms of Kirbycide, wherein Kirby jumps off the edge with someone in his mouth and releases them at a distance or position from which they are unable to recover, forcing a KO. One may Swallow at the last second for a K.O. (usually during Time Mode for an extra point) and may survive due to Kirby's tall recovery.
Kirby can also jump off the stage and Inhale the opponent who is conveniently standing by. This is the only way to Inhale Kirbycide in the original Super Smash Bros., as well as the easiest.
 Description from the Melee Instruction Booklet
 Description from the Brawl Instruction Booklet
Swallow your foes, then use their copied standard moves. Ditch the ability with the + Control Pad.
Inhaling and spitting has been a trademark attack of Kirby since Kirby's Dream Land, but it was not until Kirby's Adventure was he able to swallow an enemy to copy their attack. It wasn't until Kirby Super Star that Kirby also had different hats that indicated the power he copied. A single attack was usually enough to make Kirby lose his copied power. Kirby then had to quickly re-absorb the ability that turned into energy (resembling a star) or else it would be destroyed.
 King Dedede
Inhale is King Dedede's neutral special move. The attack is identical to Kirby's inhale in appearance, but with slightly increased range and no copying ability. By pressing the special move button, Dedede will begin to inhale the air in front of him, creating a vortex. He will continue to inhale as long as the button is held down. If a character comes near him, they will automatically be sucked inside of him and will be trapped in his stomach. When swallowed, Dedede's stomach enlarges to hold the victim, which makes him extremely slow. Dedede simply spits the character back out when the attack button is pressed, or they break free themselves.
This attack does 10% when the opponent is exhaled; if the character-projectile hits someone, it does 9 to 18% to that person depending in the inhaled opponent, the heavier it is the higher damage it does.
Dedede's Inhale (and Kirby's copied Inhale) has at least two glitches. When used on a mine from Snake's down smash, the explosion will go off continuously until it hits someone, Snake plants another mine, or Dedede stops Inhaling. When used on Ike in the middle of a Quick Draw, Ike will hit Dedede but continue past, often to his death. However, this is probably due to the vacuum effect created by the Inhale.
 Description from the Instruction Booklet
Inhale nearby opponents. King Dedede can't copy other fighters' abilities.
In nearly every Kirby game with King Dedede in it, King Dedede has shown the ability to Inhale, like Kirby. Unlike Kirby's Inhale, King Dedede cannot absorb an ability. The attack has remained mostly the same throughout the Kirby series, with the exception of Kirby's Dream Land 2, where King Dedede is able to inhale large amounts of air and spit it back at Kirby as a very powerful projectile.
 Collateral damage
In SSB, characters spit via Inhale deal 6% damage to bystanders. Starting in Melee, the damage dealt by a spit character is loosely based on their weight. Both Kirby's and Dedede's Inhales operate the same in this respect.
In Melee, the percentages dealt are exactly the same in the NTSC and PAL versions, despite the weight differences.