The guild leader of Efficient Omniscience asked where Sonny and Fredo were, and was told Fredo had gone PK. Many strips later, Fredo appeared with the SDLGDEDDLs.
Bowdlerize: Parodied. When a player named himself Dick Tracy, a GM changed his name to !@%& Tracy (and banned him for a week).
The Devs briefly introduced a filter to censor all homophobic comments, which rendered D34dly incomprehensible. It was gay.
Bunny-Ears Lawyer: This is how the other PKers view Dakilla and his enthusiasm for the game lore.
Bullying a Dragon: Baron Wolfgang Von Epeen became the leader of Efficient Omniscience following the former leader's death and decided to talk trash to Absolute Endgame - even after he was told that one of the developers was in their guild.
Comically Missing the Point: Cyborella uses the old "is that a dagger in your pants or are you just happy to see me" line on Drakoola. Drakoola pulls out an actual dagger and starts gushing over its stats.
Even Evil Has Standards: Fred the Dread and Your Name Here consider it bad form to trash talk well matched or undermatched opponents. Subverted by D34dly, who... doesn't.
The head developer draws the line at physically torturing beta testers...only just.
Eviler than Thou: Cyrus to Fred the Dread. While Fred the Dread is admittedly a bloodthirsty PKer, he genuinely grinded for levels rather than resort to hacking like Cyrus did. According to Dakilla, he also researched many exploits.
Expospeak: In-universe example: The developers use these as 'lore-nukes' to put players in a coma, to hide that the game content isn't done yet.
Fake Ultimate Hero: Ohforf has become this completely by accident. Ohforf didn't even kill the raid boss. It swallowed the new GM, burned its insides on the GM's flaming staff and killed itself on the stalactites, then landed at Ohforf's feet. That's why the new GM got the uber-buff, not Ohforf'.
Jerkass Gods: The GM's and developers are only godlike in-game, of course, but apart from this they are a prime example (when they're not just plain lazy).
Karma Houdini: Unsuprisingly, the PKing pros kill almost everyone without repercussions. Interestingly enough, the devs included Limb-Loss (a parody of Stat-Loss as was used in a real game) for PKers when they were killed as a form of karmic retribution. This is the reason Fred the Dread has a hooked hand. And Drakoola had killed so many players before dying himself, he is literally only a nose by this point.
Nominal Importance: Parodied when Sir Bob warns Ohforf while entering a high-level dungeon, telling him that each of the monsters inside are deadly enough to have their own respective names...which turn out to be human names such as Ted.
Given the name of Clichequest, it's not exactly likely to be a coincidence...
The Noob shouts out to Everquest repeatedly. Over and over again. From the gag about the elven population dwindling because the newbies walk out of the treetop city and fall to their deaths (city of Kelethin), or when the new expansion was marketed by including a 3D bustline on the package (Firiona Vie), to the author acknowledging that one of the strips was based on an experience of "camping" a monster for 17 days...
The lead developer is known in-game as Lord Saxon—a shout out to Lord British of Ultima fame.
The PKers too, to an extent. Fred and Dakilla explain to Oforf once that PKing keeps other players sharp and if they're not good enough to survive then they don't deserve to - and then ramble off a bunch of glitches and exploits they use in combat.
Stripperific: Parodied. Hypatia complains about it, and not to mention the cover for the game's expansion...