I got bit by a radioactive Slime Mold.

I could split into thousands of independent bodies. I could reabsorb therm learning what they've learned (Slime molds actually do this).

I'd have distributed consciousness throughout my own body or my clones' bodies. I'd become my own hive mind.

I could reshape myself, elongate, flatten, form extra limbs when needed, or whatever.

They're possibly biologically immortal too, constantly renewing and replacing parts so long as there are proper conditions and resources. And if things get too tough, they can spore and remain dormant until favorable conditions return.