Small discovery: the game has two different ways of saving amiibo

On the amiibo screen, scan in your amiibo. It’ll look like this:

If you change your fighter color, and then change your Nickname/Owner, only the Nickname/Owner will be different. The game seems to have a specific way of saving to amiibo that involves only saving changes to the Nickname/Owner, and leaving the rest of it as it was before. Try this for yourself.