amiibo are a series of figurines (and later cards) released by Nintendo capable of interacting with their video game consoles using NFC technology. The Wii U, New Nintendo 3DS, and Nintendo Switch support them natively, and adapters were released so they could be used on original Nintendo 3DS systems.
List of Mii amiibo
List of Mii games supporting amiibo
|Miitopia||Read-only||The Nintendo Fan will give you clothing based on the character on the amiibo. (See here for a list of possible costumes)|
|Super Smash Bros. for Nintendo 3DS and Wii U||Read-write||Amiibos can be made into Figure Players (FPs), which grow from level 1 to 50 and can have their stats enhanced with equipment.|
|Super Smash Bros. Ultimate||Read-write||Amiibos can be made into Figure Players (FPs), which grow from level 1 to 50 and can have their stats enhanced with spirits.|
|Animal Crossing: New Leaf||Read-only||Amiibos can be scanned to have that character move into an RV in their town and from there move in to the actual town.|
|Mario Kart 8 (Deluxe)||Read-only||Ammibos can be scanned to unlock costumes based on those characters for Mii racers.|