Replacing Sprites

[Snap006]

I did a search but could not find what I was looking for.

I want to create a lot of custom enemy sprites. An example being the 4 fiends from FFIV.

Is there a list of sprites that can be safely replaced in Shishi without screwing up the game. I know you can do the zombie oracles, summoners, and knights, but what about the area which has 6 male squires and the funeral people?