Like most Nintendo Wii U games, The Legend of Zelda: Twilight Princess HD features Amiibo functionality across a variety of the collectible figurines. This guide will explain what each Amiibo does.
To access the Amiibo menu, first you must reach Hyrule Field. That means getting through the first dungeon (Forest Temple). The game will then prompt you to let you know Amiibo functionality is available. From there, access the Collection menu by pressing Down on the D-Pad. Tap your Amiibo of choice for the following effects:
Wolf Link: Wolf Link can be used to quick-load a game after associating it with a save file. From the Collections menu, it can access the Cave of Shadows. Once you complete the Cave of Shadows, it can be used to restore health based on your remaining health upon the completion of the Cave of Shadows.
Link and Toon Link: Both Link and Toon Link can be used to replenish your arrows to full capacity. Each Amiibo can only be used only once per day, but that also means that if you have both, you can use the ability twice.
Princess Zelda and Sheik: Both Zelda and Sheik can be used to replenish your hearts to full capacity. Each Amiibo can only be used once per day, but that also means that if you have both, you can use the ability twice.
Ganondorf: Ganondorf doubles all damage received, similar to one of the conditions of Hero Mode difficulty. However, it stacks along with Hero Mode, which means if you use Ganondorf while already in Hero Mode, you'll receive a whopping 4x damage.