Overall, while there are instances where characters and interpretations have hinted at a romantic connection between Godzilla and Mothra, their relationship is primarily portrayed as an ancient alliance and a symbiotic partnership.
Mothra dated King Ghidorah, much to Rodan's jealousy. Despite their species are mortal enemies, the two remained together. However, Ghidorah was revealed to be cheating on Mothra by being with Hedorah every Thursday (he covered this up by saying that he was playing poker with his friends).
She is a major character in the Godzilla franchise. She is a member of Godzilla's Earth Defender faction and a major protagonist in My Little Pony: Friendship is Magic: Godzilla. She is also the wife of Godzilla and the mother of Mothra Leo, Minilla, and Godzilla Junior.
Two characters in Godzilla: King of the Monsters define Godzilla and Mothra's ancient alliance in romantic terms, with Dr. Ilene Chen calling Mothra "Queen of the Monsters" and Chief Warrant Officer Jackson Barnes questioning if "they got a thing going on," though subsequently Dr. Sam Coleman explains it as a " ...
Komodithrax is a giant reptilian monster who appears in episode 6 of the second season of Godzilla: The Series, "End of the Line." She is Godzilla's mate.
The Bride is sent to protect Japan, after it is discovered that a group of giant monsters are leaving the Hollow Earth. She defeats the Giant Chameleon, the Giant Archaeopteryx, and Anguirus in turn, and fights Godzilla, who falls in love with her.
In the Legendary Godzilla films, Godzilla is referred to as a male. Godzilla's allegiance and motivations have changed from film to film to suit the needs of the story. Although Godzilla does not like humans, it will fight alongside humanity against common threats.
Mothra Might Be Peaceloving, But She's Indubitably Overpowered. The iconic and ancient Mothra is known for being one of the good guys in Godzilla lore. She's referred to in multiple properties as a protector of humanity. As her name suggests, Mothra is a moth, albeit one that is a behemoth in size.
The markings on her wings are said to mark her as the "Queen of the Monsters" and that they apparently link Mothra to Godzilla, the King of the Monsters, since the eye spots on her wings are modeled after Godzilla's eyes.
In the MonsterVerse, the reason for the affection between Godzilla and Mothra can be attributed to their warm and symbiotic relationship, as well as their shared history and mutual respect.
The rivalry between Godzilla and King Kong is well noted within their established mythos, including and especially the current MonsterVerse canon, but there's one kaiju Godzilla hates far more than Kong (or any other Titan, for that matter): King Ghidorah - and there's only one reason as to why.
Anguirus was reintroduced in Destroy All Monsters as an ally and best friend of Godzilla living with him on Monsterland, a role that Anguirus maintained throughout Godzilla vs. Gigan, Godzilla vs. Megalon, and Godzilla vs. Mechagodzilla.
Komodithrax (コモディスラックス, Komodisurakkusu?) is a giant mutated komodo dragon kaiju that appeared in the Godzilla: The Series episode "End of the Line", whom also is Godzilla's mate.
Godzilla and Rodan are playing cards, when Rodan tells Godzilla that he's finally going to ask Mothra out on a date. This moment is ruined, though, when Godzilla reveals that Mothra has been dating King Ghidorah.
Godzilla is shown to have a crush on Gojirin, and she seems to return his feelings. Occasionally, Gojirin is a source of conflict among Godzilla and his friends, as both Baragon and Anguirus compete with Godzilla to impress her.
The type of symbiotic relationship that Godzilla and Mothra share is known as Mutualism, which defines as both species are positively affected from each other.
