Mothra is a giant divine moth kaiju who first appeared in the 1961 serialized novel The Luminous Fairies and Mothra, which was adapted the same year by Toho into the film Mothra. Mothra made her first appearance alongside Godzilla in the 1964 Godzilla film, Mothra vs. Godzilla. Her latest appearence was in the 2019 Godzilla film Godzilla: King of the Monsters.
Mothra's major distinction among Toho's library of kaiju, aside from being the first female monster in the Godzilla series, is her benevolent nature and relationship to mankind. While other monsters like Godzilla frequently menace humanity with their very existence, Mothra fights to protect humanity from monsters that threaten it. Mothra is accompanied by two miniature twin priestesses named the Shobijin, who speak to humanity on her behalf. However, Mothra has still wrought destruction herself, though this is only to rescue her Shobijin when they are kidnapped or when she is under the control of the Kilaaks.
In Mothra's onscreen debut, she laid waste to Tokyo and New Kirk City in her quest to recover the Shobijin and return them to Infant Island. Mothra returned in Mothra vs. Godzilla, where she traveled to Japan to battle Godzilla when he threatened her unhatched egg that had washed ashore there. Mothra was killed in the battle, but two twin larvae hatched from her egg and carried on her battle against Godzilla, eventually triumphing over him. One of the larvae died sometime afterward, but the surviving one took her mother's place as the goddess of Infant Island. Mothra was soon called upon to defend Earth against the evil King Ghidorah, and managed to recruit both Godzilla and Rodan to her cause. Mothra eventually matured into an adult and rescued her people from Letchi Island after they were kidnapped and enslaved by the terrorist group known as the Red Bamboo. By the end of the 20th century, a larval Mothra was contained on Monsterland, only to be released when the Kilaaks took over the island and assumed control of the monsters. Mothra was soon freed from Kilaak control and fought alongside the other Earth monsters to kill King Ghidorah once and for all and defeat the alien menace.
Mothra was reintroduced in the Heisei series film Godzilla vs. Mothra, where she fought alongside a dark counterpart named Battra to defeat Godzilla. After the Godzilla Heisei series ended, a standalone trilogy of films focusing on Mothra was released from 1996 to 1998. This trilogy introduced Mothra Leo, Mothra's son, who would go on to star in the trilogy's second and third entries following his mother's death. Mothra made an appearance in the third entry in the Millennium series of Godzilla films, Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack, as one of the three Guardian Monsters, who defended Japan against Godzilla. Mothra returned two films later in Godzilla: Tokyo S.O.S., where she and her twin larvae supported Kiryu in his battle against Godzilla. In Godzilla: Final Wars, Mothra aided Godzilla in his battle against Monster X and Gigan, and sacrificed her own life to destroy Gigan. Mothra made a cameo through a cave painting in the film Kong: Skull Island, the second entry in Legendary Pictures and Warner Bros.' MonsterVerse, and went on to appear in Godzilla: King of the Monsters in 2019, the sequel to Legendary's Godzilla from 2014. Mothra is also a major player in the universe of the GODZILLA anime trilogy, though she does not appear directly. Rather, in the backstory of this universe, Mothra defended a surviving segment of the human population from Godzilla in 2048, and helped to relocate them to the Mount Fuji area, where they evolved over time into the Houtua and continued to worship the egg Mothra left behind.
In the Legacy, Mothra is a member of Council of Light is more of the motherly figure even putting with Rodan’s jerk moments by spraying Slik in face when she was in Larvae and she has a son soon to be a member of the Council of Light. And does have the Shobijin Twin Priestesses, who usually speak for Mothra to humans mostly peacekeeping. And in the end of the Rise of Mephiles the Dark arc that she was revealed that she help cure Helen's legs after defeating Mephiles himself and his Society of Darkness, as an act of returning New York to the Teenage Mutant Ninja Turtles.
And she is voiced by Tara Strong in the English dub and Haruka Tomatsu in the Japanese dub.