The CAT.

It's really hard to get a pic of our cat that even shows up clearly, let alone reflects her personality.
That's probably a mixture of using a rubbish camera and her being black. Added to the fact that she doesn't do very much.
I imagine there are some great points to being a black cat - you look a bit scarier, witches are reputed to choose you over other coloured cats, and you camouflage at night better.
But the difficulty of taking a picture of her is a moot point between us, and definately causes friction in our relationship.