I would prefer Bupkis for him. It has come to mean an extreme form of "utterly worthless", but comes from a slang for goat dung.

For his disgusting surgically monstrosity of a half-tranny I would have gone with something reptilian ... Allosaurus sound like a good first draft. Heinous, frightening, second or third or fourth string to a T-Rex, and she's certainly a "different lizard".