Some of my under-rated favourites - probably not everyone's cup of tea, but they have completely unique ways of playing guitar and are masters of new sounds. Absolutely love them myself, though.
David Torn:
Adrian Belew:
and of course, Robert Fripp, who ranks as my 2nd favourite musician/guitarist ever:
Who's my first favourite musician/guitarist ever you ask?
Well, that would be my dad:
I'm not ashamed to plug him here next to all these big names, since he really is a world-class guitarist in his own right