to make a full character in l4d2 i need :

- a 3d character of course with a relative good number of polygon ( too much cause problem for porting), somthing under 30k should be ok for full model, there is still a way to split the model later.

- a 3d program, i have to follow splinks melee custom weapon first, it's based on 3dsmax but you can find for blender too, and blender is free. Basicly you transfer the skin ( how a model works in game) to a new model, and this is almost the same way for characters.

- external programs to decompile and compile again to create a vpk : gfscape + vtfedit + vpk.exe

- i asked few times ago to scream who ported the division character if i could change them, so i took zoey division, decompiled to get the files, inside you can see zoey is split in multiple parts : head arms backpack ...etc so i just add to find a head i like , transfer the informations of zoey's head to a new one, export to the same file format, and replace the old zoey's head file name in the .qc by the new head file name, then compiling again.

it's a rough resume of the way to do it.

Edited some  textures in photoshop for more cyberpunk colors.

If you really want to go into character modding you can add Cassie / demonchild and me so i can provide you some guide lines without doing a full tutorial, don't have full time for this but glad to help.

when you begin to know how it works it takes a full day to make a complex character done.