Hmm. Mercury is both a planet and a metal.
Sailor Mercury. Sailor Cadmium… Sailor Lead.
The planet-Sailor Mercury’s attack is mist. (Mist and not Mist, for those that speak German — though one could argue something you could compare to a bad day’s atmosphere in Shanghai is bit of a Mist- oder Scheissangriff, when others get a fireball or a lightning strike. Then again the smartest character in Sailor Moon is a cat, so what do I know.)
What if the metal-Sailor Mercury’s attack was some kind of a vapor, too? So… “Our enemies are defeated! In 1.21 years, once the heavy metals in their lungs have had time to work their… heavy metal magic!”
Wait, “Sailor Mercury”? Sailor Gemini! Sailor Apollo, fly me to the moon!
This kind of a silly game could go on forever. Take one Sailor Scout, and interpret the name in a funny way to generate others.
Sailor Mars! Sailor Snickers — Sailor Twix! Sailor Toblerone! To make an innocent girl feel guilty over what she eats is the pinnacle of villainy! In the name of chocolate, we will nourish you! (etc. etc.)