Mothra Leo (モスラレオ, Mosura Reo), also known as Leo, is a daikaiju who is the offspring of Mothra and is the central character of the Rebirth of Mothra trilogy & later appeared in Godzilla Island. Leo differs from Mothra as he is commonly labeled as a male. Plus, unlike Mothra who is usually portrayed as being concerned more for the plights of her homeland and people, Leo takes on a more active role as a protector of the Earth, as well as taking on a Gamera-like affection for children. He is an Insect Monster, like Mothra, Battra, Megaguirus, Megalon, Kumonga, Mothra12, and Kamacuras.
Leo appears with Mothra, Anguirus, Rodan, King Caesar and Baragon a few moments after Godzilla joins the Heroes some of them do not trust the heroes at first, and have to be defeated by the monsters that trust the Heroes, most noticeably, Godzilla.