Tuffnut Thorston is the male of the fraternal twins Vikings, making the Ruffnut to be the female. They are constantly arguing with each other, often to the point of physical violence, though never seriously enough to separate them (sometimes they enjoy it, if only to get some feeling back into a spot that has gone numb). They enjoy the suffering of others and when stuff are getting destroyed. In addition to their nasty tempers, they are both wild, reckless adrenaline junkies, and share an equal disdain for reading and a preference for the same weapon (a double-ended spear) in combat. The twins mount a Hideous Zippleback, which fits their fractious relationship. Each head seems to agree with one of the twins, and they ride it to great effect in the final battle and afterwards.