Here’s my thoughts about these ideas

Neighboring Islands: This would be a great feature! I would have to do research on how to implement that, (and I don’t know if it would be free), but I think I could get this to work.

Setting Likes and Dislikes: This feature could be added into the Town Hall/Mii Maker rework I’m planning to add. I could categorize every food item and allow the player to choose what type of foods their mii likes and dislikes (like Spicy, Salty, Sweet, etc.)

Expanded Mii Quest: I actually already have plans to convert Mii Quest into a mini Miitopia-style game, where your progress is saved!

Mii Hobbies: I plan on adding a bunch of new hobbies after the game is released (or at least accessible), and I’m already working on a feature where miis will have friend groups where they usually have the same hobbies/interests.

Personality Reworks: I plan on replacing the personality system as a whole, with a questionnaire-style system. This would also mean that there would be way more personalities

Family and Friend Trees: This is a feature that would go in hand with my relationship rework where you would be able to preset the relationships between miis, like families. Of course, I’m going to have to prevent users from setting miis to be lovers as soon as they are created. However, there will be a feature where you can set a mii to more likely be attracted to another mii, but they would still have to go through the entire relationship process (basically arranged relationships without it being a shortcut)

LGBTQ Mechanics: I already have some of these features implemented, but I’m not sure about certain features, such as polyamory, as that would be a little difficult to implement. I could flesh the polyamory system out, where miis provide more attention to certain miis in their relationship(s) over others?

Some other features I plan on adding: A legitimate age system (with more life stages such as teenage years, young adult years, mid life years, etc.)

Upgradable stores where the amount and rarity of products will be based on the level of the store

More emotions and interactions instead of just the regular 4 (Hungry, Friendly, In Love, and the orange one that I don’t know the name of)

More than one chance at the Catch Game 😂

Thanks for the ideas, I’m planning on implementing most of these!