I call all of mine "monsters" because as 4-month-old shoestrings they're pretty much the opposite of terrifying. I'll append -monster onto their names, so I get Targan-monster, etc.
I call my little granite male "graysnake" because, well, he is.
My little hypo lavender female got bitten by my caramel female once when I was putting them both back into their cages after feeding (caramel has quite the feeding response and apparently smelled mouse on her), and since then she's been jumpy. I call her the PTSD snake.
And not so much a name but our own meme, our little caramel is prone to pooping on us, no matter how careful we are. I dun think she's ever actually pooped in her tank. So now we say of her: "Praline poops on everything you love."