Various collectibles and figurines designed to be used as add-ons to mostly first-party Nintendo games, and their emulation support.
An Amiibo is a small figurine produced by Nintendo, which stores and relays various information for related video games via near-field communication (NFC). It was supported on the Wii U and the Nintendo Switch, as well as the Nintendo 3DS (natively on new 3DS, with an add-on peripheral on old models).
The figurine had some unique data about its type, sometimes some user save data, but its size is too small to hold any true add-on game content. When read by the game during in-game prompts, it would unlock various bonuses and content already on the disc (just like on-disc DLC), depending on the figurine's type and various other conditions.
- Cemu has partial Amiibo support. While Amiibo dumps (.bin) can be loaded and read in-game to trigger their appropriate effects, they can't be written back to. This affects, for example, the Wolf Link figurine, that's supposed to store the number of hearts for Link from Twilight Princess HD's save file, and summon in Breath of the Wild a wolf with as much HP. With the way Cemu's implementation is, this never happens and the summon only has a default of 3 hearts. Nevertheless, this can be circumvented by writing to the Amiibo on real Wii U hardware, dumping it, then using that dump with BoTW.
- yuzu added Amiibo support. It has full amiibo support
- Citra added Amiibo support in late 2018. 
Amiibo Emulation Homebrew that Runs on Consoles with CFW
These are little more than NTAG215 NFC tags. There are multiple ways to dump, store and fake these. Their common format accepted by emulators is .bin files. Additionally, there are some complete sets shared online that regularly get updated.
Do note that (on retail systems) the appropriate areas of a tag must be permanently locked after programming, for the tag to be recognized as valid.
- TagMo: An open-source Android mobile application that can be used with NTAG215 NFC tags to store and relay the same information as any given amiibo (provided they have the appropriate encryption keys). Download
- N2 Elite (formerly Amiiqo): A commercial kit consisting of a little puck capable of emulating multiple tags, selected sequentially at the push of a button, and optionally of a USB NFC adapter.
- Citra - Announcing amiibo support (November 20, 2018)