Kazooie

Kazooie is one of the main characters from the, first appearing in  for the Nintendo 64, where she serves as Banjo's partner. As a playable duo, they appear in Super Smash Bros. Ultimate as the third Fighters Pass DLC character. She belongs to a fictional species of birds called the Breegull.

Kazooie, like Banjo, is owned by Rare Ltd., a former second-party developer for Nintendo. In 2002, Rare was sold to, and the rights of both Banjo and Kazooie were transferred to the company.

Diddy Kong Racing
Although Kazooie is absent from Diddy Kong Racing, she is mentioned in the instruction manual, prior to her debut in a video game. An additional nod to her is featured in the form of a kazoo being played during Banjo's segment of the opening title sequence (though it is absent from Banjo's theme on the character select screen).

Donkey Kong 64
Both Banjo and Kazooie made a cameo in early versions of Donkey Kong 64, but were ultimately cut from the final game. Their faces were going to appear on a shower stall in DK's Tree House.

"Freeze Frame"
Banjo and Kazooie make a brief cameo at the end of the N-Gang comic "Freeze Frame", where they are seen celebrating alongside many other Nintendo characters.

"N-Gang vs. Nintendo"
Kazooie appears alongside Banjo in the 2000 N-Gang comic "N-Gang vs. Nintendo", where they play on the same soccer camp team with Wario, Yoshi, Princess Peach, Donkey Kong, and Lanky Kong. Mario referees the match.

"Die Hexe lacht um Mitternacht"
Kazooie makes a brief cameo at the end of the N-Gang comic "Die Hexe lacht um Mitternacht", where she is seen at a Christmas party with other Nintendo characters.

Mario Artist: Paint Studio
Artworks for Kazooie, along with Banjo and other Banjo-Kazooie characters, make an appearance in Mario Artist: Paint Studio.

Minecraft
On January 30, 2018, both the Wii U and Nintendo Switch versions of Minecraft received an update that included many Microsoft-related character skins, including Banjo-Kazooie characters like Banjo and Kazooie. This is the first time Kazooie appears with Mario characters in a game.

Super Smash Bros. Ultimate
Kazooie along with Banjo were announced as the third downloadable fighter in Super Smash Bros. Ultimate in the E3 2019 Nintendo Direct on June 11. The game marks the pair's first physical appearance in a new game since the Xbox 360 version of 2010's Sonic & Sega All-Stars Racing. They were released on September 4, 2019.

In the duo's reveal trailer, a Jiggy bounces across the floor as Donkey Kong, Diddy Kong, and King K. Rool are lounging in Donkey Kong's tree house, causing them to look outside the window and seeing a silhouette of Banjo and Kazooie. It is then revealed to be Duck Hunt playing a prank, in the same manner as King Dedede pretending to be K. Rool in the latter's reveal trailer. Banjo and Kazooie then appear from the sky, knocking Duck Hunt out of frame, with Kazooie holding her namesake instrument, the kazoo.

Banjo and Kazooie's moveset and appearances are directly pulled from their two Nintendo 64 titles, Banjo-Kazooie and . Spiral Mountain, the location of their home, serves as the representation for their stage.

When Kirby absorbs Banjo and Kazooie, his backpack has a plush toy version of Kazooie inside.

Classic Mode route
Banjo & Kazooie's Classic Mode route pits them against fighters that work as a team.

Palutena's Guidance
The following dialogue also applies to Joker and Hero. It was originally used for Mewtwo, Lucas, Roy, Ryu, Cloud, Corrin, and Bayonetta in Super Smash Bros. for Wii U, who are downloadable fighters in that game.
 * Pit: Who is THAT?
 * Palutena: I have no data on this fighter. I can't believe it!
 * Viridi: It must be an intruder from another dimension!
 * Pit: Whoever it is, the goal remains the same: to fight and win!