Culex is an optional boss found in Super Mario RPG: Legend of the Seven Stars. He originated from an alternate dimension called Vanda, which is only briefly mentioned in the game. He is modeled after a traditional SNES Final Fantasy boss, which is understandable seeing that the creators of the series made Super Mario RPG. Multiple Final Fantasy references can be found during the fight, including:
The overall design of the boss resembles a boss from a Final Fantasy. Some have compared him with the primary antagonist of Final Fantasy VI, Kefka.
The music played during the fight is the boss battle music from Final Fantasy IV.
The music played during the conversation with Culex is the main Final Fantasy theme.
The victory music is the same as the victory music from the series.
The crystals that Culex uses against the characters in the battle are from Final Fantasy.