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  '''Leo the Lion''' is a [[Negaverse monster|monster]] from the [[Negaverse]]. Unlike most of [[Neflite]]'s monsters, Leo's essence was not planted into an item, since Episode 16, ''Who Is That Masked Man?'', is mainly about Neflite trying to kill Sailor Moon, rather than one of his usual energy-absorbing plans. He sends Leo the Lion to attack Sailor Moon and the real Tuxedo Mask. Sailor Moon hits Leo directly in the head with her Moon Tiara Magic. At first he appears unaffected, but he vanishes shortly after while running toward Sailor Moon and Tuxedo Mask. Whether or not he was killed is not specified.
  
  His name is based off of the constellation, [[wikipedia: Leo the Lion|Leo the Lion]].
  
  This is the first male Negaverse monster seen in the series.
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