Kart Bowser
The King of the Koopas dashes by with his trusty kart and all the items at his disposal. Part of the (from mario) Jam!
Kart Bowser doesn’t play by the rules. He brought a kart and items to a fistfight.
Different item boxes appear on stage, Bowser can pick these up to get items.
If Bowser is a stock behind he gets better items.

Specials:
When you hold Nspecial you drag an item behind you untill you let go of special.
When you tap Nspecial while holding 2 items you switch the order of the items you are holding.

Throw an item forward or consume an item.

Lakitu lifts Bowser up.
Tap Uspecial while holding a throwable item to throw it upwards instead.

Bowser drifts in place until you let go of the button, then he launches forward.
In Training Mode, there’s a menu to practice with items and no RNG
By SplatRacer & Misu Misu