Read-only feature:

Invite the character to your campsite and, eventually, to move to your island / Invite the character for photo shoots at Photopia / Unlock a special poster of the character / Invite character to the Roost for a cup of coffee / Invite character to Happy Home Paradise to design their vacation home

In short: Any non-SP card from Animal Crossing Card Series 1, 2, 3, 4, 5, Promos, New Leaf Welcome, or (as of the March 2021 update) Sanrio. The Sanrio villagers can only move in via amiibo; the rest can be found through normal gameplay.

One character can be invited to the campsite per day. After scanning at Photopia or for the campsite, the character's poster will be available in the Nook Shopping catalog. The Roost and Happy Home Paradise functionality was added in the November 5, 2021 update. Happy Home Paradise is paid DLC.


Read-only feature:

Invite the character for photo shoots at Photopia / Unlock a special poster of the character / Invite character to the Roost for a cup of coffee / Invite character to Happy Home Paradise to design their vacation home

After scanning at Photopia, the character's poster will be available in the Nook Shopping catalog.

Special characters generally became available for Photopia when their model was added in an update. For example, Jack became available along with the Fall update on September 30, 2020. All remaining special characters became available with the 2.0 update on November 5, 2021. The Roost and Happy Home Paradise functionality was added in the November 5, 2021 update. Happy Home Paradise is paid DLC.

Sources: Nintendo's official Japanese website: Features, Compatibility table / GameXplain (video) / @Walrus_McCloud on Twitter (4/22/2020 additions), u/dingycollar on Reddit (Luna addition 7/30/2020), JayBee & Milly on YouTube (video) (Franklin and Jingle addition 11/18/2020), Animal Crossing World on Twitter (Pave addition 1/2021), Official 2.0.0 update patch notes (Photopia additions 11/5/2021), Majora's Puppet on YouTube (Roost additions 11/5/2021)


Read-only feature:

Unlock a special poster of the character

After attempting to scan at Photopia, the character's poster will be available in the Nook Shopping catalog.


Read-only feature:

Unlock special furniture items and a poster based on the card's Sanrio character

Added in the March 2021 update. Scan card for any amiibo feature (Photopia, campsite, etc.) and the items corresponding to that card will be available in the Nook Shopping catalog afterwards.