custom leader without mod?

[Maxor127]

I made my own Roman leader I can use him fine in single player if I have the proper XML files in the custom assets folder within My Documents. But if I try to play a multiplayer game with my brother, even if we have the same custom assets, the graphic for my leader doesn't show up correctly. I have to load it as a mod in order to get it to work. I used to just see a pink box where my leaderhead should be, but now I actually see Cyrus's leaderhead for some reason.

I was wondering if there was a way to get my custom leaderhead to show up properly in a multiplayer game or if loading it as mod is the only way to go?

 

[Refar]

AFAIK multiplayer will not load custom assets folders (Or not all of them - i think just art like Blue marble does work, but no XML or Python). You need to have it as a mod and all parties participating in the game must be running that same mod.