Ideas for future Tomodachi Life games:
The option to change a Mii's nose color
Miis with canes and walkers
More options for overbites and underbites
Bringing back the frying pan item
Bringing back the sewing machine item
Have the option to make babies grow up slowly or instantly
Bring back mini-games for babies that grow up slowly
Bring back the fortune-telling aspects from the first two games but make them actually relevant to the gameplay instead of it not affecting anything
BRING BACK THE CONCERT HALL AND LET OUR MIIS JOIN BANDS AND SING SONGS OMG PLEASE
Sleepovers (REAL ONES where they actually SLEEP OVER) and parties for Mii characters
This post will be added to as I think of more.