ok here they are:
1. Pluton is a warship under Wano, & the most famous Japanese warship is called Yamato, Yamato was destroyed during WWII, this warship length was 263 m, while the height of Yamato the anime character is 263 cm, which means that Yamato got her name from the japanese famous battleship Yamato, & Pluton is also a battleship.
2. Momo & Yamato are like two sides of the same coin, they are different but they complete each other, both are 28 years old, son of Oden & daughter of Kaido, mythical zoan DF users with fire & ice abilities, Momo controls Zou, Yamato controls Pluton.
3. Yamato has an ice ability DF, & Pluton means Pluto which is an icy dwarf planet.
4. in Greek mythology we have:
- Poseidon is the ruler of the seas which is suitable to be a mermaid in one piece which is Shirahoshi the mermaid princess.
- Pluton is the ruler of the underworld, & we have the demon princess Yamato, which is a good choice for an underworld creature.
-Uranus is the sky ruler.
5. there is an anime called Yamato the space battleship, in this anime Yamato the battleship traveled to
Pluto & killed the aliens with a very powerful blast cannon that was able to cause a huge damage to the planet surface, & Pluton will probably have powerful blast cannons as well.
also guess what, Kaido knew about it, remember when Kaido said he will fight the government using the ancient weapons, & when he told Yamato that he stayed in Wano because it's Wano, & when Yamato asked Kaido why did he steal her freedom? why did he steal Wano's freedom?
he answered: life isn't a series of simple questions and answers, he can't tell her that Pluton is in Wano, that's why he stole Wano's freedom, & he can't tell her that she is the key to activate Pluton, that's why he stole her freedom.