Future Primals and potential implementation into lore.

[Lambdafish]

Susano as in Bravely Default/Second and FF Dimensions II.
Ravana was a minor boss in Vagrant Story.

Of which they are that entity in name only. The ravana and susano-o (not even the same name) from their respective games are completely different, as much as Shiva is completely different from the Hindu god, and bahamut isn't a planet sized turtle