Amiibo

Any Nintendo Amiibo are listed here.

Amiibo are small "toys-to-life" figures that have various functions in select 3DS, Wii U, and Switch games. The only game that requires the usage of Amiibo is the Wii U game "Animal Crossing Amiibo Festival." At least one Animal Crossing Amiibo is needed to play the game. In every other game compatible with Amiibo, they are completely optional, and mostly provide small bonuses.