City of Heroes had a monster named Jurassik who carried an item which essentially amounted to a car on a stick. While this probably remains my all-time favorite melee weapon, this might very well rank second: Seal Attacks Kayaker with Octopus.
Now I really want to make an Octopi-wielding martial artist seal super-villain, but I’ve already done a nun with two pairs of nun-chucks, so it might seem a little derivative…