1. ENB. My preferred is 47: The Sequel
2. TTW 3.2. I have never done a FNV install without TTW installed, so I guess it's pretty necessary.
3. Personal Character Model. This one isn't really a life or death thing like an ENB or TTW, however, I just can't get past my Courier looking like hammered shit. Besides, if we can have custom character models, why wouldn't we.
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When you're lost in the darkness... Look for light