There are Items out of Item boxes:
Coin Shell[12] Travels along the track and leaves a trail of coins behind before exploding, leaving eight coins in a ring shape on the track.[12] Gold Shells previously appeared in Mario Kart Arcade GP DX, though they functioned differently.
Kamek[14] A crystal ball with Kamek's magic symbols on it that summons him, who then proceeds to summon many of a certain type of enemy ahead of all the racers in front of the player who used it, as well as turning them into that enemy temporarily.[52]
Dash Food[14] Various food items obtained from the smiling bags that give the player a speed boost and may change the character's outfit.[13]
Returning items
Coin Grants the player two extra coins and a small boost.
Coin Box Temporarily places a ? Block above the player's head, which they can repeatedly hit, giving them coins while also scattering more coins behind them.[86]
Green Shell Travels in a straight line and knocks over a kart it hits.
Triple Green Shells Three Green Shells that orbit the player's kart, protecting them from incoming attacks.
Red Shell Homes in on the closest kart in front of the player and knocks it over.
Triple Red Shells Three Red Shells that orbit the player's kart, protecting them from incoming attacks.
Spiny Shell Targets the racer in first place, knocking over all other karts in its path.
Banana Peel Protects the player from incoming items, and spins out other racers that hit it.
Triple Bananas Three bananas that orbit the player's kart, protecting them from incoming attacks.
Mushroom Provides the player's kart with a small speed boost.
Triple Mushrooms Orbits the player's kart, providing them with three separate speed boosts.
Golden Mushroom Provides the player's kart with continuous speed boosts for a short time.
Mega Mushroom Increases the player's size, allowing them to flatten any player they hit.[86]
Feather Causes the player to spin and leap in the air, allowing them to reach high areas, avoid attacks, and even drive on walls.[12]
Fire Flower Allows the player to throw up to eight fireballs for a short time that cause other karts to spin out on impact.
Ice Flower Allows the player to throw up to eight ice balls for a short time that cause other karts to temporarily lose control on impact.[12]
Boomerang Flower Can be thrown up to four times, hitting racers forward/backward and returns to its user before the final use.
Star Provides the player invincibility from all terrain and items, and also giving a speed boost.
Super Horn Emits a radial shockwave hitting racers, as well as destroying all obstacles, including the Spiny Shell.
Lightning Causes all opponents in front of the player to drop their items, shrink, and drive slowly for a short time in addition to summoning a temporary storm.[12][16]
Hammer For a limited time, allows the player to throw multiple bursts of five hammers each, which travel in an arc and stick to the track, spinning out any player that comes into contact with them.[12]
Blooper Sprays ink on all racers ahead and reduces their visibility. The racers hit also lose some of their traction while sprayed.
Bob-omb Explodes after a short time when thrown or dropped, knocking over any kart in its blast radius.
Bullet Bill Transforms the player into a Bullet Bill, rocketing through the track with auto-pilot, and providing invincibility from all terrain and items.
Boo Steals an item from a randomly selected racer in front of the player, while granting temporary invisibility, making the player invulnerable and able to pass through hazards.
The above text is from the Super Mario Wiki and is available under a Creative Commons license. Attribution must be provided through a list of authors or a link back to the original article. Source: https://www.mariowiki.com/Mario_Kart_World