Kain/Cecil sprites request

Not bad at all, suggestions:

For the portrait, if I'm seeing it correctly, might try to set the background to the "clear" or whatever the invisible background color is called (should be very first color in the palette). Not a big thing, but with FF6 not having square portraits, It'll stand out as a direct import from FF4, but not required by any means.

As for Yang, might shade the corners of the square skin color on his head. As in, change the corner pixels to the darker skin color to make the shiny spot more round than a clean square. Its noticable in the sheet, might not stand out in game though.

Last note? Including the "about to kick pose" on the extra spot, nice, based on what you've described not being able to easily use it in battle for a kick command would be an issue. You might swap it for one of the "finger wag" poses.

I don't recall Sabin ever using finger wag in-battle, and any use outside of battle could easily be changed to use "extra pose" instead of "finger wag 2" while still being able to use it in a Kick command animation.

On that last note, it might be possible to setup Jump to become "Kick" for that character. It would remove his ability to use "Jump" correctly, and require some coding... But very possibly doable. Would still require a "Kick" animation script and damage code... But again, possible.