Could we use passive helicopter-like rotors instead of a parachute? There's a manoever possible with helicopters alled "autorotation" that allows for (relatively) safe landing in the event of engine failure. The same idea might work for a one-person backpack helicopter. I'm not a pilot, though, nor am I familiar enough with helicopter physics (or Wile E. Coyote gadget designs) to say whether it would really work.
Mokalus of Borg
PS - From videos, it still looks difficult.
PPS - So probably not a great idea, but interesting.