Stefan is the joker of the group. He is able to mimic sounds and voices perfectly, and uses his wits to poke fun at people who are pompous and cruel, such as Tursgud. This skill is used multiple times in multiple training exercises and battles to confuse the brotherbands enemies. He will not crack jokes about people who are weaker than him, aiming only at those who are stronger, with bad personalities. He admires Hal for his skills.
He isnt a good fighter at all, he is like Edvin, but, he's abillitys helped the herons in the book 1, the outcasts, when they wore trying to invade the Sharks brotherhood house, then, Stefan made a good of a messe, he used the voice of Tursgud and confuse all the sharks.