Increase your Friendship Level with the islanders by completing their orders at the Trade Post. Increase your Friendship Level with merchant traders from neighbouring islands by completing the orders at their island Trade panels.
Each time you increase a Friendship Level for a character on your island you are rewarded with a special treasure chest!
For the characters on your island the maximum level is 21. For the characters on the neighbouring islands the maximum level is 10 (except Carl, which is 5).
Increasing your Friendship Level with characters unlocks new item recipes, Bazaar recipes and decorations, and develops the characters' history and storylines.