https://www.fimfiction.net/story/121836/the-bridge-a-godzilla-mlp-crossover
 
“I am the Mercurial Guardian, protector of Love and Intelligence! Douse yourself in water and repent!”
 
The mantle of a Guardian can be inherited by any compatible soul within Neighpon, but not all of them are ponies or kirin despite what Raine may appear to be at first. Though it did cause some confusion when her predecessor tracked the newly budding powers of the next Mercurian Guardian to both a school and then, only an hour later, to several kilometers out at sea.
 
Raine nevertheless possessed the right heroic soul for the job, despite her typical shyness when moving about on land in disguise. To be fair, most would if you lost your legs in the middle of an exam if you got splashed by some salt water. Still, hard work breeds success and between her work as a Senshi and inventor she’s seen a lot of it.
 
Inspiration for the senshi armor: kaylathehedgehog  
Mercury symbol: Jeatz-Axl  
Creator of Sailor Moon: Naoko Takeuchi