Undertale - Fish facts

Yeah, I know the name comes from that, but I don't really see her as a water elemental outside of being a fish…
…wait…
>"They are usually found in forest pools and waterfalls."
>>"What undines lack, compared to humans, is a soul."

WAIT.
>>>>>"*Marriage with a human* shortens their lives on Earth, but earns them an immortal human soul."

dogsong intensifies