I’m a confirmed Helium Head from way back, so of course I want a personal robot blimp!
Funin Zhang and colleagues at Georgia Tech are developing little blimps that recognize humans and follow them—some of the behavior needed for an indoor companion blimp. 
Blimps have advantages and disadvantages over other home robots. Like any UAV, it has limited lift and cargo capacity especially compared to a ground vehicle. On the other hand, as Evan Ackerman notes, the lighter than air craft has less noise and scary whirling blades, and moves slowly and calmly. In short, Blimps are “friendly” and safe.
These blimps don’t move or maneuver fast, and they are pretty large—very noticeable. My own view is that visibility and slow movement is a feature, not a bug. Most of the time, I want to know if there is a robot watching me, and to be able to out run it (or out fight it, if necessary).
The basic blimps of the research project are just little party balloons with airscrews. But they can certainly be decorated, possibly with message boards or expressive faces. Or go full Festo!
I don’t know what missions they are thinking about for these blimps, so let me suggest a couple. For one thing, a blimp can dust the tops of bookcases and sweep out cobwebs on ceiling. (Let’s see a Roomba do that!) A blimp might also be a handy mobile night light, bringing a gentle glow to where you need it at night.
If you simply must track your children and pets (and granny), a blimp is a lot friendlier than other systems. It’s easy to know when you are being watched, and you can bat away the snoop.
A blimp could also be a nice way to guide a forgetful elder or visiting stranger. “Follow me to the bathroom”.
I could imagine using a blimp to gently get attention. Drop down from the ceiling to hover in your face to remind you to take your meds. Or when the kids need to be called, maneuver in front of the screen, and flash the message that dinner is ready.
- Evan Ackerman, Blimps Seem Like the Friendliest Kind of Indoor Flying Robots, in IEEE Spectrum – Automation. 2917. http://spectrum.ieee.org/automaton/robotics/drones/blimps-seem-like-the-friendliest-kind-of-indoor-flying-robots
- Ningshi Yao, Emily Anaya, Qiuyang Tao, Sungjin Cho, Hongrui Zheng, and Fumin Zhang, Monocular Vision-based Human Following on Miniature Robotic Blimp, in IEEE International Conference on Robotics and Automation. 2017: Singapore. p. (to appear).