Zhu Wu ranks 37th among the 108 Liangshan heroes and 1st among the 72 Earthly Fiends and is nicknamed "Resourceful Strategist".
Described in the novel as a handsome man with blazing eyes and a long beard, Zhu Wu dresses like a Taoist priest and carries a hand fan made of crane feathers.
His expertise in military strategy and battle formations earn him the nickname, hence its effect being able to set "Fire Formations" from the GY or Deck.