The powers grants the user a substitute form from their human form whether their own body is severely damaged or not. By transferring a vital organ (the brain) or the mind of the user into a robot body fully operational by the user.
Donatello (Teenage Mutant Ninja Turtles 2012 TV series and IDW Comics only)
Jules Hedgehog (Archie's Sonic the Hedgehog)
Ichiro Inuyashiki (Inuyashiki)
Hiro Shishigami (Inuyashiki)
Ultimate Man (DC Comics)
In any continuity, Metallo (DC Comics) has his physical mind transplanted into a robotic body.
The Brain (DC Comics)
Fugitoid/Honeycutt (Teenage Mutant Ninja Turtles)
Donatello/Donbot (Teenage Mutant Ninja Turtles 2012 TV series); Donatello (Teenage Mutant Ninja Turtles 2012 series) in an alternate future had his mind transferred to Metalhead MK-II after his body was badly damaged.
Due to near-fatal injuries, Donatello's (Teenage Mutant Ninja Turtles IDW) had to have his mind transferred to Metalhead while his body healed.
Jules the Hedgehog (Archie's Sonic the Hedgehog)
Using the Big Gete Star, Cooler (Dragon Ball Z) can construct Meta-Coolers to serve as replacement bodies.