A Shyster is an enemy that appears in Super Mario RPG: Legend of the Seven Stars. Shysters are a species of Shy Guy that work under Mack and the Smithy Gang. After Mario and Mallow get back the Frog Coin from Croco, they return to the Mushroom Kingdom where the town was being overrun by Shysters. Shysters are found bouncing around in homes and chasing Toads around. They are even more common in Princess Peach's Castle. Once Mack is defeated, all of the Shysters will leave.
In battle, Shysters mainly attack by hopping at either Mario or Mallow. They can also use a move called Drain that can deal moderate damage to Mario or Mallow.