Final Fantasy Hacktics

I've been playing around with customized sprites recently trying to make a more 'unique' team par say than the game normal has to offer, but then I ran into the problem of actually applying the new sprites to the game. I've used the sprite editor and all to change sprites, (unused ones like celia) but how do I get that into my team? I've been trying to use the save game editors because I think that's how you do it, but i just don't know. It wants me to use some .gme file that I don't have, and i don't know how to just change the sprites of my current team members to the customized one and it's just all iunno. Pretty much I'm changing sprites that aren't naturally used in the game, which means i can't get them naturally into the team, so how do I do it?

You need to use fftpatcher (or should).  There is an tab labled entd.  Find entd 188, this is the scene at the military academy.  This is where you get the generics at the start of the game.  Replace the generic sprite sets with your new ones from shishi.