Blade Brothers

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Biography
The Blade Brothers are self-trained swordsmen, and have each won the fighting tournament at the Picori Festival. If Link trains with them, they will grant him various techniques for his Sword, generally in the form of Tiger Scrolls. Each brother resides within his own dojo, although Swiftblade's is the only one that is actually a building; the other Brothers reside within caves, graves, and even hollowed-out Trees. Each of the Brothers who award Link with Tiger Scrolls use the Possession Technique, which allows them to control Link's body and demonstrate the technique. The other three Brothers instead use "visualization training," and tell Link to focus on his Sword performing more ably.

Although Link must visit Swiftblade and learn the Spin Attack in order to complete the game, the other Brothers are completely optional. Link can sometimes train with a Brother as soon as he finds them, but they usually require him to have achieved a certain accomplishment before they will teach him. Furthermore, the three Brothers who upgrade Link's previously-learned techniques can only be found after fusing Kinstones with the other Brothers.

Swiftblade
Swiftblade is the second eldest of the Blade Brothers. His dojo is a building in the southwest corner of Hyrule Town.

Grayblade
Grayblade is the youngest of the Blade Brothers. He lives in a cave on the eastern side of Mount Crenel.

Waveblade
Waveblade is the fourth youngest of the Blade Brothers. He lives under a tree on the southwest side of Lake Hylia.

Grimblade
Grimblade is the third eldest of the Blade Brothers. He lives in a cave on southeast side of the Hyrule Castle Garden.

Scarblade
Scarblade is the second youngest of the Blade Brothers. He lives in a waterfall cave on the northeast side of Castor Wilds.

Splitblade
Splitblade is the fourth eldest of the Blade Brothers. He lives in a waterfall cave on the southern side of Veil Falls.

Greatblade
Greatblade is the third youngest of the Blade Brothers. He lives in a waterfall cave on the western side of North Hyrule Field.

Swiftblade I
Swiftblade I is the eldest of the Blade Brothers, and "lives" under his grave on the southwest side of Castor Wilds.

Trivia

 * Although both the Figurine and the game only features eight Blade Brothers, Swiftblade claims in the Swordsman Newsletter that there are a total of ten Blade Brothers.