I'm pretty sure you could do that without the powers. It's would only be temporary, though. Like "FUSED!...separated...FUSED!...separated...FUS ED!" You get the picture.

I'd want a superhuman healing factor. Got shot through the gut? Five seconds later, good as new. The pain wouldn't even be that big a deal, just so long as it was impossible for me to sustain any kind of permanent, crippling or disfugring injuries.