Rarely has the phrase 'last but not least' seemed more appropriate: Pat from Andy And Fiona ("Note the missing tooth - probably lost whilst biting a man"), Pirate From Cathy (her neighbour's one-eyed cat), Sid Vicious from Shobhain, The Muel from Julia, Tilly from Bruno, Castro From Sheri (a cat that's not only hard but radioactive), Gloucester from Selena, Jasper from Abigail, Murphy from Emma (are you serious, Emma?) and Oscar from Jeff.
I'm tempted to add several of these to the shortlist (see two posts below), but I think it's only Sid Vicious and Tilly who really make the grade. Tilly is obviously a comically ineffectual name for a hard cat, but I don't think I've ever seen a feline look so menacing - haunting, even - whilst damp. It's also been suggested by my closest advisors that Castro should be going on the list, but I get the sense that, as fuming as he looks in this pic, two minutes after it was taken he'd reverted to being a, well, pussycat.