Ax Crazy: He threatens Greg with a knife, while yelling something about how the knife demands a blood sacrifice. Yeah, that seems pretty frigging crazy.
He did the same thing to Todd.
Big Damn Heroes: Does this in "Night of the Evading Dead" in Season 4.
He pulls one off again in the Season 6 finale "The Reunion" when he runs over Trent with a Scorpion just in the nick of time... without even knowing he did so until after performing the task.
Chief: its kinda cool cuz liek hes saying activaet but thers one were he dosnt get 2 ear it all teh way so its liek its deactivatid / but then he saes it agen aftur so its liek its activatid agen adn tahts wat teh whoel song is abot / u no wat i m33n / its prety deep adn metallic if u think abot it
"hello i am mastur cheef lolololololololololololol" from the original Master Chief Sucks at Halo trilogy
In Season 6: "FREEZE / TOSERS / GET DOWN ON THE FUCKING GROUND
"Sad face :("
"remember? lol remember arbiter?"
Character Development: A little. Since the start of the series, he's started to care more about Arbiter, even admitting that he is sort of his friend. It is even hinted that he cares about Claire a little in "Remission", and in "Severance", after fragging Kylie, he looks back at the corpse of her avatar before going after Arbiter, which implies that he's feeling a little bit of regret.
Pet the Dog: For all his horrible acts (and his entire attitude in general), he can show signs of genuine kindness, with the most outstanding moment being in "The Reunion", where he reassures the Arbiter that he will not die alone, and that the Master Chief, despite all of his comments towards the Arbiter, does appreciate his companionship.
Weapon of Choice: An assault rifle and the Spartan laser, though recently he has traded in the laser for a rocket launcher.
You Keep Using That Word: a few instances can be found earlier, but Season 5 introduced this as a regular character trait. Examples include "metallic"*
Author Avatar: As acknowledged by Jon in an interview.
Author Filibuster: Delivers many that speak of Jon's opinions on the gaming world and specific games. While he makes good points, the fact that the plot will oftentimes slam to a halt for the Arbiter to deliver a filibuster in his Microsoft Mike voice can be grating to some viewers.
Big Damn Heroes: He pulls one off at the end of the episode "Hard End" in Season 6.
Catch Phrase: "Sigh". Though it does not catch that very frequently.
Don't Explain the Joke: "I see what you did there. Instead of addressing my points, you took everything that I said and turned it into a sexual joke, implying that I suck on men's penises. Fantastic.".
Drunken Master: Despite his drinking he still kicks ass at Halo as seen when he takes down two hackers
Characterization Marches On: Used to have a couple of lines that depicted her as short tempered and unreasonable in Endgame, her character has since then been refined.
Just Friends: Doesn't return Arbiter's feelings. They still have a healthy relationship though.
What Happened to the Mouse?: She disappears after "Wedding". She reappears in "King" where it turns out she was kidnapped by an Alien along with Todd and Travis. She comes back for good in the Season 6 finale.
Shout Out: His name is a reference to the character of the same name from another machinima "Matchmaking", made by Darkspire Films. Travis is a fan of Darkspire Films as well.
Chekhov's Gunman: In the penultimate episode, he turns out to be a former member of an underground hacker organization and helps Arbiter and the Chief find this organization where they get hacks to return to Trent's wedding to crash it.
Season 6
TOSERS
The Terms of Service Enforcement/Response Squad, who's objective is to keep online gaming fair and enjoyable. Arbiter refers to them as Game Police.
Hey, It's That Voice!: Averted. After "TOSERS" (Third episode of Season 6), many people commented saying that one of the TOSER members was voiced by or sounded like Gus. However, this isn't actually true according to Word Of God.
Kevin
A thirteen year old player who joins TOSERS.
Big Damn Heroes: Saves Arbiter and Chief from Clyde, Adam and some other hackers.
The CEO of a gaming studio who is going to have the biggest in game wedding in history. It turns out he is marrying Claire, and it also turns out that he's cheating on her. In Season 6, he turns out to be the one behind Chaos Theosis.
Non-Action Big Bad: He prefers to leave everything to Cameron and Cody. In Collapse though, he actually does try fighting Arbiter once. In Season 6, he doesn't even try to fight Arbiter and Chief and just runs away, leaving Clyde to hold them off.
[1]: In "Remission", they end up saving Claire from Clyde using a falcon. They later show up at the roof while Arbiter confronts Adam. However, they get shot down by Duncan.
Evil Genius: Played with. He's not evil, he's just doing his job as a network administrator assigned to protect Trent and his wedding. He ends up becoming an antagonist anyway since the guy he's protecting is a douche who cheated on his fiance.
Whoops, never mind, turns out they're just Psychos for Hire, with the exception of Duncan.
Clyde
Back from the Dead: He makes one final appearance trying to stop Arbiter and Chief from fragging Trent on Breakpoint. When Chief and Arbiter are confused as to why he was back since they had fragged him in the previous episode, he reveals that he has multiple alts and was using his old console. He still gets fragged by Arby in the end.
Big Bad: For Season 6, though it turns out that Trent was behind the whole thing.
He-Man Woman Hater: Insults Kylie for her gender and general inadequacy after she was fragged by Chief.
Laser-Guided Karma: Having literally just finished with the above, he is immediatelyfragged by Chief and Arbiter.
Villainous Breakdown: Possibly. When he finds out that Kylie and Adam were both fragged, he noticeably lowers his guard greatly and swears at Kylie a lot over Skype. Also at the beginning of the season he is calm and only swears during a Precision F-Strike, but as time goes by and Arby and Chief interfere more and more and things start to stop going his way, he descends into several Cluster F-Bomb.
He seems to have recovered from it by "The Reunion", though.
Even Evil Has Standards: He is taken aback when he learns that his fellow hackers plan to take down the OMN.
He-Man Woman Hater: Duncan finds, out of personal experience, that most girls are not up to his MLG skill level. However, he does seem to actually like Kylie, seeing her as the exception to the rule, and he looks down on players with a Stay in the Kitchen attitude.
It seemed more like he was just asking Kylie if people with that mindset got to her, he doesn't exactly have a politically correct mindset, especially as the episode Cradle to Grave reveals that his gamer tag is "back2thekitchen88"
Screw This, I'm Outta Here: In "Femme Fatale", Duncan decides that he has had enough of what Chaos Theosis is doing and that it isn't right. Shortly after, Kylie assassinates him.
Serious Business: He is described as a hyper competitive MLG player.
Token Good Teammate: He was the only member who was actually in it to take down TOSERS.
You Have Outlived Your Usefulness: Duncan decides to back out when Clyde reveals that he plans to take down Xbox LIVE. Clyde and Kylie lure him into a 'clan meeting' and stab him in the back.
Evil Counterpart: To Chief. Arbiter even calls him "the human version of Chief".
Karmic Death: Though it isn't death exactly, but his defeat and fragging might not have happened if he hadn't treated his mum and his friends like crap.
This deserves a bit of expansion: Adam is cornered by Arby and Chief in a private server, he tells one of his "friends" to take them out. This "friend" who had been threatened with a permeant ban by Adam that very episode refuses to, saying that he's had enough of Adam. At that moment, Adam's mother walks in with a police officer, saying that Adam is going to a correctional facility. He breaks down, desperately pleading with his Mother not to send him away. He begs Arbiter, Chief and his "friend" to vouch for him, upon which his friend remarks, "Lock his ass up and swallow the key". As Adam is dragged away, he begins swearing furiously, as the Arbiter coldly shoots him in game...Ah, Karma.
Adam: "YOU'LL FUCKING PAY FOR THIS ONE DAY MOM YOU HEAR ME?! I HOPE YOU DIE IN A FIRE YOU FUCKING CUNT! I HOPE YOU FUCKING DIE!
Your Mom: He uses this a lot. Not as much as Chief though.
Justin "SniperDeathAngel00"
Evil Genius: He developed the hacks used in Season 5, the Fragban hacks and the Permanent Denial of Service hack.