the dog is lycha and the jelly is ario
they are one creature but also two and they call themselves lychario
from a planet where there's no land and everything is water
but there's like caves and stuff with air too and the jellyfish allows them to breath both air and water
but the dog and the jellyfish are two separate creatures but they get merged at a very young age and cannot be separated
but they each have their own thoughts and stuff but they can also sorta talk to eachother without actually talking and kinda have the same thoughts idk