I would like to see these changes as well. Really I would like an option to select the sovereign background without editing the xml files, and whenever I choose the wizard stance where they hold out their hand I would like to see a particle effect for the highest level magic skill I have presently chosen. (Blue for water, Red for fire, Green for earth, Yellow for air, White for life, Purple for death... something along these lines.

I do realize it is editable in the xml, but it would be nice to have the options there anyway.

In your steam directory you can find all the files of your games

For FE in particular its the following

...\FE Legendary Heroes\data\English\

this is where all the core files are stored for LH,

otherwise you can find the unit files you created in your documents folder under \my games\