Also I thought of something
You know Mikoto, the Hoshido queen? Her name, Mikoto is a common title for gods.
The most well-known being Susanoo-no-Mikoto.
What’s Susanoo known for? Storms and winds.
And what does Hydra attack with? Water hurricanes.
Water+wind=storms=Susanoo

Susanoo-no-Mikoto, in a way, can be said as Susanoo’s Mikoto.
As in Hydra’s Mikoto.

I think Fire Emblem did a reference to one of the three major gods of Japan, WHILE foreshadowing Mikoto being under Hydra’s control.
GG, FE Fates.