Wife:
Collect the 4 "Backward rear" secret codes.

Unicorn:
Collect the 3 "Wrinkling Cream" secret codes.

Spy:
Check a container Artila Wilderness Ruins.

Samurai:
Check a container in Rock Castle Sky Cave.

Miser:
Check a container on the Miracle Plateau (Artila).

King:
Given by man in Lifeborn B51 after completing the Stacker art.

Dragon:
Tokione B2 Security Storage.