Well, okay, rereading one and then rereading another. And because they're both incredibly fantastic, I'ma rec them here! (As though that course of action wasn't so predictable a mongoose could have guessed it.)
First, The Journals of Karkat Vantas, Nerevarine:
(http://archiveofourown.org/series/48699)
It's, well, exactly what it sounds like: Karkat the Dunmer as the Morrowind player character, with all the ranting about everyone and everything and creative insults addressed to all and sundry implied by that description. It's really, really hilarious, and also incredibly well written and in-character. I suggest if you like either Homestuck or the Elder Scrolls to go check it out because it's pretty accessible even if you don't have both fandoms. I literally reread the while thing today, and it was just as amazing as I remembered. And Karkat getting annoyed at game mechanics like his inexplicable ability to swim in armour and the complete insanity of everyone who isn't a player character will never not be funny.
Aaand second! is One of Our Submarines:
(http://archiveofourown.org/series/23579)
This...is so fantastic. I literally just found it today, and...wow. It's written entirely in chatlogs and dialoglogs, which is really, really impressive, because all the characters, even the OCs (especially the OCs) feel so real, and I spent much of the story feeling incredibly distressed, but in a good way. It's a rebellion AU, which is, admittedly, pretty common, but it focuses mostly on the Helmsmen and Sollux and the Psiioniic, and Karkat's revolution only really comes into play about halfway through. Also, I never thought I would respect Eridan, or really have any other emotions towards him other than apathy and murderous intent, but the way he's written in this fic... And let me remind you that there's not narration, only dialogue. Wow.
Also, if you read it, there's occasional dialogue hidden in code, thanks to distressed Helmsmen, so have this translator thingie always on hand! (http://paulschou.com/tools/xlate/)
-Aila