What started as a puss-filled zit on your shoulder soon turned into a fully sentient vestigial twin. Just another unexpected side-effect of living on a mostly irradiated island.

Sadly, he didn't fit under your armor so off he came, but, surprisingly, the tough little sucker survived!

Now you and he are inseparable in an entirely different way as your mini-me has proven quite adept at smashing rocks. He's also good for casual rounds of football, keeping watch over the stuff in your boxes, and, in a pinch, being lobbed at enemies when you run out of other stuff to chuck at them.

He's the best friend you ever grew.