Huey, Dewey, and Louie

Huey (red), Dewey (blue), and Louie (green) are the three nephews of Donald Duck and great-nephews of Scrooge McDuck. In Kingdom Hearts, they work in the item shop in the First District of Traverse Town. Here, the three take turns selling items. In Kingdom Hearts II, they run an item shop, a weapon shop and an accessory shop in Radiant Garden. In both endings, they are all seen going back to Disney Castle.

Huey, Dewey, and Louie are related to Donald Duck, whom they refer to as uncle, Daisy Duck who is their aunt, and Scrooge McDuck.

Kingdom Hearts Birth by Sleep
The trio appears in Disney Town participating in the world's mini games. They are having trouble handling the ice-cream machine when Ventus arrives, but they manage to make it work properly with his help. During the ending credits, the trio race on the Rumble Race ground, with Huey as the victor.

Kingdom Hearts
Judging by conversations with the three in Traverse Town in the item shop, one can clarify that the three brothers went off to seek their fortune. They tell Donald that they wished to make money so they went off to start their shop. During the ending credits, they are seen returning to Disney Castle.

Kingdom Hearts II
They also appear selling stuff in their shops but this time in Hollow Bastion and each of them have their own shops. During the ending credits, they return to Disney Castle along with King Mickey, Goofy, Donald, Scrooge, Jiminy Cricket and Pluto.

Kingdom Hearts coded
Huey, Dewey, and Louie appear during Data-Sora's adventure in Data Traverse Town in Episode 2. Data Cid is looking for them when Sora shows up and Cid asks Sora to look for the triplets.

Shops
In Kingdom Hearts, Huey, Dewey and Louie take turns being the shop barter in the Item Shop in Traverse Town. In Kingdom Hearts II, Huey is in charge of the Accessory Shop, Dewey is in charge of the Items Shop and Louie is in charge of the Weapons Shop in Hollow Bastion/Radiant Garden.

Appearance
Huey, Dewey, and Louie are virtually identical to one another except for the color of their clothes. They are a trio of small, anthropomorphized ducks with yellow-orange beaks, legs, and webbed feet, four-fingered hands, white plumage, thin, grey "eyebrows", and light blue eyes that almost seem to glow. Each wears a long-sleeved turtleneck shirt and baseball cap. Huey's cap and shirt are red, Dewey's are blue, and Louie's are green.

Despite being depicted as kids in Kingdom Hearts, the trio still exist ten years in the past (during the events of Kingdom Hearts Birth by Sleep), living in Disney Town. This suggests that they may be older than they look or the flow of time is different in Disney Town.

Origin
Huey, Dewey, and Louie appear in several animated cartoons and comic books published by. They first appeared in a newspaper comic strip in 1937 and their first animated appearance was in the theatrical short, released in 1938.

Trivia

 * Strangely, it's not ever shown how Huey, Dewey, and Louie ever got to Traverse Town if Disney Castle wasn't destroyed. Plus, it's unknown why they wouldn't be at Disney Castle in Kingdom Hearts II, but instead at Hollow Bastion, yet they do tell Ventus that they're going to save up Munny to go on a big adventure.