Fears, wishes and dreams
It would be cool if the characters could have fears, wishes and dreams like if your person have a fear and that fear comes true they get a moodlet saying fear came true. For wish let’s say for example your character wants to go to the park so then when you character goes to the park they can get a moodlet saying wish came true and they will be happy about it. For dreams it could be where your character really wants to do something and if they complete there wish they will be extremely happy about it. in the sims 3 and 4 there is be lifetime happiness points so I think when you complete a wish or dream you get points and you can use those points to spend a lifetime happiness shop.
Also I think it would be cool if like you make you character pretty or ugly other people would be more attracted to you and it would be easier to get in relationships but if your character is ugly it would be harder.
So these are my ideas for the game