From the Super Mario Wiki, the Mario encyclopedia
Golden Bananas are large, shiny bananas that first appear in the Donkey Kong Country animated series, and later in their first in-game appearance in Mario Party and more prominently in Donkey Kong 64. They often appear as collectible items.
Donkey Kong Country television series
The Donkey Kong Country animated series features a single Golden Banana of a different type in the episode "Raiders of the Lost Banana". This Golden Banana is found by DK in Inka Dinka Doo's Temple, and he decides to give it to Candy Kong as a present. As a result, however, DK sets off a curse that befalls anyone nearby the beholder. K. Rool later kidnaps Candy and demands she hand over the banana, but DK shows up to rescue her and returns the banana to Inka Dinka Doo. However, Polly Roger then steals the banana back, but now only K. Rool is affected by the curse.
Donkey Kong franchise
Donkey Kong 64
During the opening sequence, King K. Rool orders the Kremlings to steal the Golden Bananas and kidnap the other four Kongs (who are later freed) in an attempt to distract Donkey Kong while they repair the Blast-o-Matic. B. Locker is assigned by K. Rool to block the Kongs from entering the other worlds; however, B. Locker allows them to enter if they have at least a minimum of a certain number of Golden Bananas (the requirement is different for each world).
During their adventure, Donkey Kong and the four other Kongs (Diddy Kong, Tiny Kong, Lanky Kong, and Chunky Kong) must collect Golden Bananas in every world, by completing various tasks and challenges. There are 25 Golden Bananas in every world, five for each Kong to obtain. There are a total of 200 Golden Bananas to collect in the seven worlds and the hub location, DK Isles.
Tiny can obtain a 201st Golden Banana from the Banana Fairy Princess when she and the Kongs have captured every Banana Fairy. This Golden Banana is hidden behind a door, which the Banana Fairy Princess opens if the Kongs have recovered every Banana Fairy. This Golden Banana is different from other ones because of its larger size, and it has the Rareware logo on it. All 201 Golden Bananas are required to achieve a 100% completion rating and to unlock the secret ending.
A Golden Banana bunch appears as the early HUD icon for the Golden Banana in the kiosk demo; it appears if players win Diddy Kong's Mine Cart mini-game. A single frame of the icon appears in the final game, as the emblem on B. Locker's head.
Donkey Kong Barrel Blast
Golden Bananas appear in Donkey Kong Barrel Blast, where they are found after passing over a Surprise Panel and are worth fifty bananas when collected.
Donkey Kong Country Returns
In Donkey Kong Country Returns, a single Golden Banana makes an appearance. While leaving Cranky Kong's Shop, Cranky Kong can sometime ramble about finding a Golden Banana that transports one to another dimension. After accessing the Golden Temple via the Rare Orbs, Donkey Kong and Diddy Kong are surprised to see the giant Golden Banana, held by two golden DK-like statues. Peeling its skin and tasting it does indeed transport them to another world.
Mario Kart series
Mario Kart 7
Mario Kart 8 / Mario Kart 8 Deluxe
The Golden Banana statue reappears in Mario Kart 8 and Mario Kart 8 Deluxe as DK Jungle appears as a retro course. It now appears in the anti-gravity section of the inner Golden Temple section, and it spins.
Mario Kart Arcade GP DX
"Gold Bananas" appear as an item in Mario Kart Arcade GP DX. It can only be dropped from behind. If the player comes in contact, it causes their kart to spin out, making it difficult to operate for a certain period of time. Triple Gold Bananas are also available.
Mario Party series
A golden banana in clusters makes their game debut in Mario Party as the mysterious treasure that is locked away in the ancient ruins of DK's Jungle Adventure. At the end of the game, during the award ceremony, the winning player's stars form a giant Star which flies to the stone chest at the upper-left part of the board, which reveals the treasure.
Mario Party 4
Mario Party 9
A large, golden Banana Bunch appears in Mario Party 9 in the minigame DK's Banana Bonus, where it moves left and right in the sky off-screen and can be reached by launching into the golden Barrel Cannon. After doing so, the player is launched to a higher area with Banana Bunches and the golden Banana Bunch, which is worth ten Bananas.
Sprites and models