Change a character's representation in VIM

Hello !
Would anyone have any idea how to go about changing what vim displays
for certain characters ?
All I'm asking for is, that vim prints to the screen a different character
than the one that's there.
EXAMPLE:

FILE.txt: (normal vim)
hello world :) abcdefghijklmnopqrstuvwxyz
FILE.txt: (custom vim)
he110 w0r1d :) @bcdefghijk1mn0pqrstuvwxyz

------------------------

As in the file contents are the same, but what you see on the screen is
different than what it normally is
I hope I was clear :)




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