Modding the Name
Each survivor's name shows in the character selection in lobby and on loading screen and in-game when a bot is controlling the survivor.
NOTE: All eight survivor names are in the same file, so a different survivor replacement addon could change the file. Only one addon's changes to the file will show up. If more than one addon includes this file, then those addons will show a conflict because of it.
Change the name:
Copy resource\l4d360ui_english.txt to the resource subfolder within your addon's Release VPK folder.
Edit each survivor's name in two places, as indicated for each survivor. For example, for Bill replaced by a guy named Hunk, change the "as Bill" and "Bill" to "as Hunk" and "Hunk".
Bill
"L4D360UI_Loading_As_Bill" "as Bill"
"L4D360UI_NamVet" "Bill"
Francis
"L4D360UI_Loading_As_Francis" "as Francis"
"L4D360UI_Biker" "Francis"
Louis
"L4D360UI_Loading_As_Louis" "as Louis"
"L4D360UI_Manager" "Louis"
Zoey
"L4D360UI_Loading_As_Zoey" "as Zoey"
"L4D360UI_TeenGirl" "Zoey"
Coach
"L4D360UI_Loading_As_Coach" "as Coach"
"L4D360UI_Coach" "Coach"
Ellis
"L4D360UI_Loading_As_Ellis" "as Ellis"
"L4D360UI_Mechanic" "Ellis"
Nick
"L4D360UI_Loading_As_Nick" "as Nick"
"L4D360UI_Gambler" "Nick"
Rochelle
"L4D360UI_Loading_As_Rochelle" "as Rochelle"
"L4D360UI_Producer" "Rochelle"
Save the file.