Diabel (in the first boss battle): Squad-F! For fuck's sake, stop playing Bejeweled! Arrgh!
Artificial Stupidity: The NPC Companions that make up the bulk of the Moonlit Black Cats guild in Episode 3. Two are from quests that Keita never finished so they would stick with him and do most of the work for him, and one is from the tutorial... Which he never finished. They tend to spout dialogue from their specific quests that loops every few minutes or so, and act just as problematic as most A.I. 'bots in other games. Only in SAO, the consequences of their stupidity result in the death of the only human player on the guild besides Kirito and Keita, Sacchi.
Berserk Button: Kirito has several of these, including, but not limited to:
1. Insulting his level/stats, or implying he's on par with weaker players.
2. Insinuating that he sounds like a girl.
3. Being psycho-analyzed by someone with what amounts to a single class of experience, who's obviously posturing.
Break Them by Talking: Seems to be (or have been) Rosalia's method of choice, using what Kirito aptly described as "first-year psyche-student" analysis to try and get inside her opponents' heads and psyche them out, breaking them until they're a "gibbering mess" so that her Titans' Hand goons can finish the job. Needless to say, this comes back to bite herwhen she pushes Kirito too far.
Character Development: In the Beginning, Kirito was a dick, nothing out of the ordinary for a typical player in an MMO, but as the series has progressed he has gone from merely a dick, to a Jerkass, to caring for others, to Becoming a complete Sociopath who killed a player who, although tried to harm or even kill him, wasn't even capable of harming him.
Conservation of Competence: In episode 4, two members of the Titans Hand guild seem to realize pretty quick that Kirito may be a major threat before they even attack, one even putting together the following:
Mook 1: Um, Boss? A thought occurs, this guy thought he was going up against LaughingCoffinnote The most feared guild in SAO, due to being made up of psychopathic P Kers, which in the game, means you die for real IRL , but he still just brought himself and a small child. Are we sure we want to mess with this guy?
And another when Kirito tells them he will let them attack first responds to their boss with:
Chronic Hero Syndrome: As a result of the events of Episode 3, Kirito's PTSD Trigger pretty much forces him into this role, compelling his brain to act against his will and involve him in other people's problems, which he would never do normally, being the Heroic Comedic Sociopath that he is.
Death by Adaptation: In the original show, Kirito merely sends Rosalia to jail. Here? He straight up murders her in cold blood, despite her being not threat to him. Also Pina.
Driven to Suicide: The Sheer Stupidity of the other players cause Diabel to refuse the health potion.
In Episode 3, Keita of the Moonlit Black Cats also gives up and jumps off the side of Aincrad, due to both his entire guild dying in a dungeon he sent them into to replace an item he sold to the mob, and the knowledge that the mob would be coming for him to pay back the debt for not being able to recreate said item.
Embarrassing Nickname: Poor Klein. His character's name is "Balls_Deep69." The jokes practically write themselves. Kirito usually refers to him as either "Balls" or "Ballsy," much to his chagrin and despite his insistence that he use his real name.
Everyone Has Standards: Even Kirito. Upon entering SAO on launch day and discovering tons of ads everywhere, he is outright disgusted. And it only goes downhill from there.
Kirito (upon seeing the ads): AH! Come on, really? That's just disgusting. Activate ad-blocker.
Popup appears: "SAO STORE- Purchase "Ad-Blocker" DLC for $29.99?"
Explain, Explain... Oh, Crap!: What happens during the fight with Illfang during the second episode when it brings out the Nodachi instead of the Talwar listed in the beta-tester's guide book. Instead of outright saying why it's bad that the weapon's a nodachi instead of a talwar, Kirito proceeds to give a small lecture over the history of both weapons first, only summarizing his point after Diabel is mortally wounded.
The Cat from Episode 2 is now the The Don of the game's mob.
Heroic Comedic Sociopath: Kirito is this, big time, to the point that Klein straight up calls him a sociopath in the third episode.
Gone Horribly Right: Well, Rosalia did want to break Kirito's resolve with her limited understanding of human psychology. Too bad it worked a little too well, and ended up with Kirito going full sociopath on her and killing her.
Dizzasta and KaggyVA from PalletTownChampions' Fairy Tail Abridged voice characters in episode 4.
Hopeless With Tech: Asuna. Full stop. She doesn't even know how to open the menu, which is literally a matter of life or death given that most of the interactions within SAO are done through the menu. How she managed to survive the first month is nothing short of a miracle, and the ending of episode two shows she still has no idea how to open the damn thing. Also, while she is a competent fighter and strategist, she obviously hasn't played MMOs before, having no idea what "XP" stands for, and thinking that "DPS" has something to do with sex.
Hilarious in Hindsight: If Silica hadn't told Kirito EVERY problem in her life, Pina would have been alive at the end of the episode, Chain Fetch Quest and all.
How Do I Shoot Web: Again, Asuna. Not with the game's combat engine, but with opening the menu. The most basic requirement for doing literally anything in the world of SAO, or any VMMORPG out there. Best evidenced in a flashback to where she tries to eat a pastry of some sort.
Asuna (exasperated): ... HOW DO I EAT YOU?!?!
Klein also has shades of this in the first episode, but this is justified in both that it's his first time using Nerve Gear, and that they're just discovering the "logout" button doesn't exist. Or, as he himself put it:
Klein: Dude, its Nerve Gear, I can't ALT+F4 this shit.
Kindness Button: In the aftermath of Episode 3, Kirito has developed a particularly nasty emotional trigger that causes him to lapse from his jerkass persona into actually caring about someone else' problems for a fraction of a second before relapsing, in the form of the phrase "Not your fault," or just "your fault."
Laughing Mad: Kirito goes utterly nuts after one too many jabs from Rosalia.
Sir Jack Dapper: And in time, Kirito found that he could almost tolerate [the Moonlit Black Cats], much like a fat man tolerates the tapeworms in his intestines. And like those tapeworms, that guild burrowed deep into his innards, and gorged themselves on his leftovers, until they began causing abdominal pain and diarrhea.
Only Sane Man: Kirito mainly, given that most of the other background/randomplayers are complete idiots. Diabel also qualified, before his untimely demise, being the only one with any real drive to try and clear the boss room, rally the other players, and try to come up with workable strategies that wouldn't result in all of them getting brutally slaughtered. His exasperated order-barking during the battle with Illfang was not unlike that of a Raid leader trying to rein in a party of n00bs, with the same amount of success.
Kirito: Wondering why your attacks aren't doing anything? Y'see it's quite simple. My numbers, are bigger than yours.
Precision F-Strike: Made possible by Kayaba/Taka disabling the profanity filter following his speech in the first episode. Given that this is the Internet and an MMO though, this was bound to happen regardless of whether or not it was bleeped out.
In fact, the very first words said after Kayaba disables the profanity filter are "We're fucked!"
Red Eyes, Take Warning: When Kirito has gone full crazy, his face darkens and his eyes glow an ominous red. You have a brief window of time to back off though, when his eyes shrink to the size of pinpricks in rage. It signals the start of nerd rage driven madness.
Shaggy Dog Story: The timer on Pina's heart runs out just as Silica tries to resurrect him.
Take That: Given that it takes place in an MMORPG and this is the Internet, this is pretty much expected. Goes hand in hand with a lot of self-depreciating humor.
A good example is shown early on during Kayaba's introductory speech to the players about the death-game:
Kayaba: Much like the World of Warcraft, none of you are hear by choice anymore. Unlike WOW, however, you're being held here by me, not by your need to escape your empty fucking lives.
Another one from Kayaba:
Random Player: When was the last time you heard of someone beating EverQuest?
Kayaba: When was the last time you heard of someone playing EverQuest?
Random Player: ... That's fair.
Later shown in the list of acceptable losses to be sacrificed to defeat the first boss, Illfang the Kobold Lord, as listed in the guide book written by the beta-testers:
"Good rule of thumb, if a player asks you for gold two seconds after meeting you, front lines. If they hijack conversations to rant about their political views, front lines. If they ask female players for pics of their boobs, front lines."
From Episode 3, the stupidity of the NPC Companions that Keita roped into the Moonlit Black Cats by not finishing their respective quests seems to be a stab at the short-comings of A.I. characters and 'bots in gaming, and the tendencies for their programming to either hinder progress or outright derail the gameplay and end in everyone getting killed.
Episode 4 seems to be one to people who think that learning a small amount of psychology (or any kind of "important" knowledge for that matter) automatically makes them an expert at it, and that it applies to real-life situations with little to no reprecussions on their part. This takes the form of Rosalia, who's "first year, psyche-student bullshit" ends up being her undoing when she tries to use it to breakKirito.
Troll: Asuna wanted half of the rare item that Kirito got, but since it's only one item, Kirito offers a trade, but Asuna is unable to do so. Why? Kirito told her to open the menu, knowing she had no idea how to
The Sociopath: In Episode 4, it's shown the events of the previous episode have taken a major toll on Kirito's psyche, Where he was once merely a dick, he is now a full blown sociopath, with little remaining of his emotions other than rage and a bit of sorrow, in fact he straight up kills Rosalia note as opposed to canon, where he just sent her to jail when she and Titans Hand were clearly no threat to him. Can be considered Character Development.
Verbal Tic: The NPC Companions in the Moonlit Black Cats. All they can say is dialogue from their specific quest-lines. Two are regular quests, while one is from the tutorial.
Gary: We must save my family!
Charlie: The bandits are coming!
Video Game Cruelty Potential: Keita takes advantage of the fact that the NPC Companions for the quests in the game have to stick with them until their specific quest is completed to basically turn them into slaves by never finishing said quests and thus making them the bulk of the Moonlit Black Cats. However, their aforementioned Artificial Stupidity ends up being the guild's undoing, as well as his own.
Episode 4 opens with Rosalia arguing with Silica to let her skin Pina just so she can upgrade her Leatherworking skill!! Yes, apparently, you can use your pets in SAO as emergency ingredient items for boosting your own stats. Screw emotional attatchments, I need dragonskin leather pants!
Kirito: She's right, you know. Dragon Leather is surprisingly comfortable.
In episode 1, the dialog box that prompts Kirito to buy the Ad-Blocker DLC is twice as tall as him.
Episode 4 has the game vocally announcing "Item has expired!".
We Have Reserves: The basic strategy listed in the guide book for dealing with Illfang the Kobold Lord in Episode 2 is basically this. Kinda grim, given that the weaker players suggested to be used as canon-fodder are actual people.