Yeah, Sal was a pretty interesting character. I loved all the emotion there, and the tension and suspicion really made for an intense perspective. I'm fond of Gavin (the character) from Lisa the Legend, too. Especially with where his character is right now; we sort of know the struggle he's gone through, but I kinda think that we don't have a complete perspective of it. It's interesting how his personality has two sides; he's cynical most of the time lately, but we really saw another side of him come out a couple of chapters ago. I won't spoil it for those of you who haven't read it, though. A fic I think is fairly under appreciated is Tiponi, Dćmon League Quester. That has several unusual characters, but I think Medwin really stands out for me. You can't help but love his straightforward demeanor.
As far as published books go, I'm fond of the Artemis Fowl series. I'm intrigued both by the title character, Artemis, who's the kind of character you know you should hate, but yet you love him anyway. The portrayal in that series is really unique. I also like Foaly, the sarcastic, ingenious centaur. Again, very unique.