I didn't want to sound negative, sometimes having choices that don't matter are still okay at times usually ideal in repeatable events so players can see all versions of the dialog. I think when choices should matter is when you get a hub screen to choose which character to focus on. so you could do it with how ever many characters you add have daily options to see who you give a drop of the potion to and how often you do for that character to create a diversity of character sizes based on the player's choices.