King Dedede

• Unlock a costume resembling this character

Community-reported

• Unlock figure in an amiibo-exclusive pose of the character (requires Chibi-Robo amiibo)

Community-reported

• Receive better rewards

Community-reported

• Receive amiibo-exclusive cosmetic gear based on the character

Community-reported

• Receive two Picture Pieces, a Maxim Tomato, and two Point Stars

Community-reported

• Receive star coins and a boost item

Community-reported

• Receive more useful adventure items than with other amiibo.

From NintendoSource

• Give Kirby a character-based power-up, once a day per character

Community-reported

• Build a statue in the plaza that plays music

Community-reported

• Equip a power-up hat matching the character

Community-reported

• Receive more useful items

Community-reported

• Give Kirby a Copy ability based on the character's abilities and a health item

Community-reported

• Unlock a Kirby-themed racing suit

Community-reported

• Unlock a character-based puzzle

Community-reported

• Receive a random title or avatar item, up to five times a day. Each amiibo can be used once a day.

From NintendoSource

• Unlock a Kirby pattern

Community-reported

• Receive 10-20 Fragments

Community-reported

• Unlock a character-based Mystery Mushroom costume

Community-reported

• Battle and train up a computer-controlled Figure Player of the character

Community-reported

• Battle and train up a computer-controlled Figure Player of the character

Community-reported

• Battle and train up a computer-controlled Figure Player of the character

Community-reported

• Receive 20 Fragments

Community-reported

• Unlock a character-based Yoshi yarn pattern

Community-reported

• Unlock a character-based Yoshi yarn pattern

Community-reported

• Unlock randomly assigned three-minute NES or SNES game scenes. Subsequent scans change the scene.

From NintendoSource