If you want to add them to the main game its in the Distant Worlds Universe root folder then \images\units\characters
In the root folder 'characters' you also have to add them to the mortalen.txt.
With lines like this
0, Bakra Taghran, 5, X, Mortalen, 41, 25, 40, 58, 0, 0, 0, 0,
Where X is the name of the pictures you've added. Like say MortalenCharacter1.png
If you've never modded before it can be a bit daunting. But it's easy enough when you just figure out the correct sequence.
edit: And don't let my bad explanation deter you - there are good guides out there and you can see the official modding guide for more help if you want.
< Message edited by Rosbjerg -- 6/15/2015 10:57:51 AM >