"Raiden to Leviathan?" and "New Battlefield?"

Okay, I have it mocked up where Leviathan is just a palette/sprite swap of the Terrato summon, and I can see that utilities are not going to help me much on this one. There are a few limitations:
1. Raiden doesn't have separate animation from Odin, so there's no block of bytes that can simply be overwritten without it affecting Odin too.
2. As far as I can tell, animations have 4 parts. All of the spells happen in part 2, which is used for the summons to display the Esper's picture.
3. We can't re-use many animations, since Leviathan is both wider AND taller than most other Espers. I did a manual edit of the sprite to fit him into the block of sprites called by Terrato. Tritoch is another possibility, but it'll take some finesse.