What can I modify in "amiibo" in Nintendo Switch System Settings, "amiibo Settings" in Wii U System Settings, and Nintendo 3DS HOME Menu Settings?

You can register a nickname and link a Mii to an amiibo with the “Register Owner and Nickname” option.

The "Delete Game Data" option on Nintendo Switch or “Delete amiibo Game Data” option on Wii U and Nintendo 3DS family systems can be used to delete save data from the amiibo. This will allow you to save data from another game that uses the read/write functionality.

In addition, you can reset and clear all settings from an amiibo, including nickname and Mii data, with the “Reset amiibo” option.