To change your COD name, simply change your STEAM name.
Goto STEAM, click Friends tab at the top. Then click change profile name. 
COD : WW2 Friendly characters
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❤❥웃유♋☮✌☏☢☠✔☑♚▲♪✈❞¿
♥❣♂♀☿Ⓐ✍✉☣☤✘☒♛▼♫⌘❝¡
♡ღツ☼☁❅♒✎Σ✪✯☭➳卐✞
℃℉✿ϟ☃☂✄✫★☯✡☪
₧⌐░▒▓│┤╡╢╖╕╣║╗╝╜╛
 ┐└┴┬├─┼╞╟╚╔╩╦╠═╬ 
╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀
αΓΣστΦΘδφε∩≡⌠⌡■|。


COD : WW2 Coloured Chat

^1 - RED 
^2 - GREEN 
^3 - YELLOW 
^4 - BLUE 
^5 - CYAN 
^6 - PINK 
^7 - WHITE 
^8 - DEFAULT MAP COLOR 
^9 - ORANGE 
^0 - BLACK 
^; - YALE BLUE 
^: - LIGHT YELLOW