The Legend of Zelda: The Minish Cap/Kinstones

Once you obtain the Kinstone bag, you will be able to collect and fuse Kinstone pieces with others. When you walk up to a person a thought bubble may appear. This means they have a Kinstone piece you can fuse with. To fuse with them press. Kinstone fusions unlock a variety of things that are indicated by icons on the map. There are a total of 100 possible fusions. Ten of them have to be done to advance the story. Only a few fusions are available at the start and more become available as you progress through the story. Kinstone pieces can be found from cutting grass, opening chests, or dropped by enemies. They can also be bought from the Goron merchant in Hyrule Town for rupees.

People
Kinstones can be used with the following people, some on multiple occasions:

Hyrule Town

 * Anju
 * Bremor
 * Candy
 * Chai
 * Forest Minish
 * Hurdy-Gurdy Man
 * Julietta
 * June
 * Breve
 * Farore
 * Lolly
 * Stranger
 * Baris
 * Dottie
 * Marshall
 * Romio
 * Crenel Hermit
 * Klaus
 * Brocco x3
 * Mama
 * Naryu
 * Postman
 * Town Minish x3
 * Din x2

Castle Garden

 * Forest Minish

Castor Wilds

 * Business Scrub

Cloud Tops

 * Caprice
 * Flurris x2
 * Gale
 * Hailey
 * Siroc x2

Eastern Hills

 * Eenie
 * Forest Minish
 * Meenie

Lake Hylia

 * Borken
 * Forest Minish x2
 * David Jr. x2
 * Librari
 * Waveblade

Lon Lon Ranch

 * Ankle
 * Goron x2

Melari's Mines

 * Melari
 * Mountain Minish x4

Minish Village

 * Forest Minish x2
 * Gentari

Minish Woods

 * Belari
 * Business Scrub x2

Mt. Crenel

 * Grayblade

North Hyrule Field

 * Forest Minish

Royal Valley

 * Dampe x2
 * Gina x2
 * Spookter x2

South Hyrule Field

 * Forest Minish
 * Tingle x2
 * Smith x2

Trilby Highlands

 * Forest Minish
 * Knuckle

Results
The results on matching Kinstones are:

Castor Wilds

 * creature
 * hole x2
 * joy butterfly
 * lily x3

Hyrule Castle Garden

 * creature
 * ghost gone
 * hole x2

Hyrule Town

 * build house
 * chest
 * chest game
 * hole
 * Kinstone seller
 * rent house

Eastern Hills

 * beanstalk
 * chest
 * creature

Lake Hylia

 * beanstalk
 * blocked cave
 * chest
 * crack in ground

Lon Lon Ranch

 * chest
 * hole

Minish Woods

 * hole x2
 * chest x6
 * creature
 * red potion
 * remote bombs

Mt. Crenel

 * beanstalk
 * chest x3
 * creature x2

Mt. Crenel's Base

 * chest

North Hyrule Field

 * chest
 * hole x6

Royal Valley

 * chest x2
 * hole
 * joy butterfly

South Hyrule Field

 * teleport
 * chest
 * hole x2

Trilby Highlands

 * blocked cave
 * chest
 * hole

Veil Falls

 * arrow
 * chest
 * creature
 * Goron
 * hole

Western Wood

 * creature
 * hole
 * way through x3

Wind Ruins

 * joy butterfly
 * chest x2
 * creature
 * hole