Exp and levelling up would be pretty cool to have (honestly, hit by a car? pah! I'm level 99!) it would also mean that going into old age would be viewed as a good thing (if you've got that much exp...you MUST kick ass!).
Regenerating health (taken from Halo 2 onwards, Gears of War and many others) would be another handy ability. It could save lives (honestly!), imagine if someone has been mugged in the street and say that someone stabbed/cut them with a knife, in reality they would bleed out or die from their wounds, with regen they would be fine (if a bit shaken up) after a few minutes.
Regenerating health (taken from Halo 2 onwards, Gears of War and many others) would be another handy ability. It could save lives (honestly!), imagine if someone has been mugged in the street and say that someone stabbed/cut them with a knife, in reality they would bleed out or die from their wounds, with regen they would be fine (if a bit shaken up) after a few minutes.