Shulk

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

Community-reported

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

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 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 useful items or experience. Each amiibo can be used once per day, up to three different amiibo per day.

From NintendoSource

• Unlock a character-specific weapon skin for characters using the Swordfighter Class

Community-reported

• Receive in-game tokens, which can be used to unlock music and animated 3D models of various characters

Community-reported

• More easily unlock special costumes / Receive useful items and experience points

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