Characters
The easiest way to customize a character is editing the texture files.
You can find the textures to edit in this folder :
\Data\Characters\NAME\RESOLUTION\BITDEPTH\
NAME : name of the character to edit
RESOLUTION : resolution to edit (hires, medres, lores or vlores)
BITDEPTH : choose to edit 24bit texture files or 256 colors
Note : you should begin you editing with the files in \hires\24bit
Then, you can scale down and reduce the bitdepth for each other folder.
Enjoy your editing !
Please note that you can download some edited characters on other site, see the links page.