Stalfos are animated skeletons mostly from the remains of dead warriors who still have a strong will to fight, and serve evil powers such as Ganon or Vaati, though there are beasts such as Stalhounds and Stallord (which appeared in Twilight Princess as a boss, "Twilit Fossil Stallord"). According to a Kokiri in Ocarina of Time, all Hylians who become lost in the Lost Woods become Stalfos.
The standard Stalfos appear in all games excluding Majora's Mask, and attack by shooting arrows, jumping on Link, or throwing their own bones at him. Stalfos Knights appear in A Link to the Past, Link's Awakening, The Wind Waker and Twilight Princess. They carry armor, swords, and a shield. Shrouded Stalfos appear in Link's Awakening, Oracle of Ages, and Oracle of Seasons. They use swords, shields, and bows to attack Link. Stalchilds appear in Ocarina of Time and Majora's Mask. They are child-sized, and attack by swiping at Link. In Majora's Mask, they are led by the giant Skull Keeta, and his master Igos du Ikana. Similar enemies named Stalkin appear in Twilight Princess, wielding small spears.
In Skyward Sword, Stalfos can be found in the Skyview Temple, in order to obtain the Beetle. They fight by wielding 2 swords. A similar enemy, Stalmaster, is an elite member of the Stalfos, where can be found in the Ancient Cistern and Sky Keep. IGN cited Stalfos as an example of "spooky and frightening enemies".
Read more about Stalfos: See Also