Wow that is one messed up battle sprite. Off hand I'm not sure what could of caused that. Is it even her sprite still but with some crazy random palette? I can't really tell... It almost looks like either Terra's battle sprite or palette data got changed or damaged. Are you familiar with using a hex editor? I'd check to see if Terra's battle sprite data is still correct here:
Code:
palettes for characters (battle): address, palette value and related character:
C2/CE2B 02 Terra
pointers for battle graphics: address, 3-byte pointer, referenced address, sprite ID, size of data
C2/CE43 00 00 D5 D50000 00 16A0 (Terra)
Her battle graphic data at D5/0000 - D5169F should be the same and not all changed if you compare it to a clean ROM, and the pointer at C2/CE43 should still be pointing to that.
Have you tried re-importing her sheet though first? And all you did before noticing this is import some new monster sprites? You didn't go over the allocated space limit and save or anything right?
I'd guess that somehow data spilled over into the sprite battle graphic data, Terra being affected since she is first, but no idea how. But since only her battle graphic is being affected I'd say it must be this.
I'd be willing to look at your ROM if you are not familiar comfortable with hex editor.
It's very easy to unknowingly corrupt various things so I'd recommend getting in the habit of making backups all the time. I mean, these things can usually always get fixed back to working, but sometimes it's just easier and less stressful to have a recent backup at the ready
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