In order to edit the map sprite in the statsheet of a unit, you need to follow these steps--

1. Decompile Fire Emblem DS ROM.
2. Go to Data->2->Class Name
3. The "palette" file can be edited via a hex editor and contains the palette. The 'idle' file contains the actual image.
4. By copying/pasting the files of one thing to another, you can literally switch the map sprites up. Remember to back
up all your files though. You can also edit it via hex editor to customize it even further.

NOTE- Doing this has been known to cause some shift-arounds with the data; offsets
are likely to be changed. If you are worried, don't bother doing this.
