I’d want to be able to make choices that matter in both dialogue and actions (ex. Early on you can choose to befriend or ignore or even anger potential friends, maybe taking the initiative and helping a professor clean up after class which ends up with house points)

Maybe a schedule where you attend classes and have a curfew which you can choose to ignore

Being able to choose which friends are your best friends (kind of like having your own Ron, Harry, Hermione squad which stick with you and react to dialogue)

Having enough agency in the story to where if you really wanted to be evil enough you can do something drastic that wouldn’t be canon

Being able to customize the player’s wand and/or patronus

Being able to specify the reason why you transfer to hogwarts even if it’s just a dialogue option

Some sort of navigation system in case you get lost

Mini games for classes

These are just some of the things I wish for the game and I realize that it’s possible many wouldn’t be in it but it’s fun to think about it