Simple idea. Everyone has a small quadcopter that helps them. Picks up small things, takes pictures, reminds you of appointments (makes appointments … with other people’s helper drones why not), what’s that song, etc. Everything a smart phone does and more. Why not just use a smart phone? The drone doesn’t accidentally fall into water. What happens if it does? Well we just have a bunch of micro drone stations everywhere. Your new drone shows up in minutes if not seconds and you never know that something was up with the previous one.
Now the important part. Customization. That’s right you too can have a Bit from Tron floating around. Or Navi from Zelda 64. Or whatever.