Cerberus

Cerberus is a reoccuring creature in Final Fantasy games. His appearance is generally modeled after his namesake, the three headed dog that guards the gates of Hades in Greek Mythology.

Final Fantasy I
Cerberus appears in the Final Fantasy I & II: Dawn of Souls release in the Earthgift Shrine. He is one of four optional bosses that appear on level 5 of the cave.

Final Fantasy XI
Cerberus is a boss in the storyline regarding the Final Fantasy XI: Treasures of Aht Urhgan expansion.

Final Fantasy Mystic Quest
Cerberus is an enemy type from Final Fantasy Mystic Quest. It is similar to but stronger than the Werewolf.