Dixie Kong originates as Diddy Kong's girlfriend and sidekick in Donkey Kong Country 2: Diddy's Kong Quest. She went on to appear in the starring role in Donkey Kong Country 3: Dixie Kong's Double Trouble!. Since then, she has been one of the main recurring characters of the Donkey Kong franchise. Her original design in the SNES games had her beret feature a Rareware pin to coincide with Diddy Kong having the Nintendo logo across his hat, though this feature was removed in all of her appearances following Rare’s acquisition by Microsoft in September 2002.
Dixie Kong appears as a trophy.
Dixie was a scrapped design for a playable character, as evidenced by leftover references for "dixie". According to Sakurai, Dixie Kong was intended to be teamed with Diddy Kong, where the two could be tagged out for each other in the midst of battle, similar to how they played in Donkey Kong Country 2: Diddy's Kong Quest; the idea, however, was cut after he ran into technical issues with implementation of the idea, and only Diddy Kong appeared as a solo fighter in Brawl.
Dixie Kong reappears as a trophy in both versions, and referenced as a color scheme for Diddy Kong. Additionally, in Super Smash Bros. for Wii U, Dixie Kong appears as a red Smash Tour item, which gives the user an extra double jump for the duration of a battle.
Dixie appears as two Spirits (one of herself and one of her and Kiddy Kong on a raft) and was referenced as one of Diddy’s color schemes again, and her hat, hair, and ponytail appear as Mii Fighter headgear.