Check out this hamster-ball for humans. You could probably use it as a shield or something and use it as a personal “mobile” device at the same time.
User can move in any direction; walk, jump, roll, crawl, run over virtually unlimited distances
Life-like movements inside cyberspace
Standalone or networked
Need to change the purpose of use? Just reload the software
Mobile solution, transportation in middle size car, assembled in 4 hour