Badass Boast: Let's face it, Omnius is the Traveler. You'd be hard pressed to find a moment where he doesn't seem to say one of these.
Forgotten Fallen Friend: Averted, Amber still hangs in Omnius' mind, with him still reflecting on her constantly, with him even telling Princess Cadence sadly of his time with her long after she died..
Hurting Hero: Even with all that power, Omnius isn't protected from his own tragedies. Just try not feel like your heart is breaking for Omnius at this: I needed to ensure that at least one life could be saved that night.
I Let Gwen Stacy Die: Amber. A truly heartbreaking example, considering Omnius reflects on how she was alive that morning.
Meaningful Name: Omnius can be considered a corruption of the english word ominous which aptly would describe the feeling his enemies would get. It also could be considered a wordplay on the latin word omnis which means 'all' which would fit his occupation of Traveler, overarching all universes.
Who Wants to Live Forever?: Discussed in the first paragraphs. Ultimately subverted for the most part with Omnius who enjoys his immortality.
Abusive Parents: Implied first chapter. Stated third chapter. Horrifically and brutally shown Chapter 14.
Komodo's father: '“YOU HAVE NO IDEA WHAT IT’S LIKE TO BE FATHER FOR YOU SHIT HEADS! WHO FEEDS YOU? I DO! WHO GIVES YOU A HOME? I DO!! WHO GAVE YOU LIFE?!? I DID!!! I DID EVERYTHING FOR YOU BOTH AND THIS IS THE THANKS I GET?”' - Right before slapping Komodo in the face.
The Berserker: Komodo's rage is his ultimate weapon and driving force. Throw in claws that tear through flesh, black flames that engulf everything and enemies and you got many many corpses laying around. His brutal mutilation of the Diamond Dogs seems to suggest that he's starting to enjoy fighting due to being in a new body.
When All You Have Is a Hammer: Let's face it, Komodo's not one for strategic movements or fancy tactics. He'll simply uses his flames and let his rage do the limb ripping.
Komodo: "SON OF A MOTHER FUCKING PIECE OF SHIT-RIDDEN ..."
Idiot Hero: He might not be a certified idiot, but antagonizing the dragon slayers who captured you by eating the gem off of one of their staffs probably isn't the smartest way to go about your situation.
Lonely Rich Kid: Not one genuine friend. He, however, got many classmates taking advantage of his kindness though.
Chivalrous Pervert: Knightmare was already a bit of a perv s a human. Turning into a Breeder-type Changeling drove those tendencies into overdrive. However, he's always struggling to remain respectful of everyone he meets, especially the lovely ladies of the Chessverse, instead of giving in to his new instincts.
Ninja Pirate Robot Zombie: Knightmare is an insectoid, equine, anthropomorphic, Bard/Paladin warrior, demon-summoner, incubus whom is simultaneously a rockstar, high-general, knight, and prince all at once. and that's BEFORE factoring in his shapeshifting. WOW what a mouthful!
The Paladin: in D&D terms, Knightmare is best described as a 'Holy Liberator' Paladin trained as a Bard/Sorcerer + Firearms training.
All Your Powers Combined: The Legion is formed of the combined might of Knightmare◊, Nyx◊, and Kngihtmare's 3 'Combat Forms'; Veltianna◊, LAHIRE◊, and Nightmare Sol◊, combining the fast-thinking fighter with the demon-goddess and her holy counterpart and the nigh-unkillable catgirl and the faster-than-sound robot SOUNDS like a good idea on paper but...
By the Power of Grayskull!: The only warning of what you're in for is this phrase. "In the Eternal battle of Supreme Benevolence Versus Absolute Evil. The Beast Always Triumphs. My Name is Legion, for We are Many!"
One Riot, One Ranger: When you have the blood of a police force who ate nails and where feared by other nations militarys in your veins, It's not a good idea to mess with you.
Reluctant Warrior: When your as good and experienced with violence as he is, you tend to look for a peaceful resolution foremost.
Improbable Aiming Skills: When you go to the shooting range once a day for 25 years, on a good day, you tend to get good. Rifles, pistols, shotguns, sub and normal machine guns, he's got experience with all manner of weapons and has religiously trained with them.
Giving Up On Logic: If it wasn't for more "Top Secret" missions the could be counted and more than one encounter with an organization that formally employed a certain musical Changeling, he would have lost it long ago. He now just take things in stride rather then let it bother him.
Incorruptible Pure Pureness: Good to a fault, as long as those around him are safe and content he is happy. Years of pain and suffering as well as his rather ampathic outlook has made him rather selfless and immune to temptation for there is nothing more he really wants. Everything he dose, He dose in the interest of others because he believes it's other people who give life meaning.
Super Soldier: His training, experience, daily practice routines, and "Never good enough" mindset has made him quite the threat. His new body also gives him the Super Toughness perk.
Flash Step: The potential of blink combat was too much for Epsilon to pass up. Through brutal magic endurance training and constant practice he has developed the ability to warp using little to no energy, using a highly efficient and perfected self made combat teleport. Towards the end game he's mastered using it in rapid secession now using Teleport Spam.
Aniseed Jameson Vortexmouth
Extreme Omnivore: Being Parasprites, Aniseed and The Swarm are able to eat practically anything. At one point they use this ability to become "sanitary engineers". Guess how they did it?
More Dakka: A core component of Aniseed and his swarm's main style of fighting.
Kamehamehadouken: Another core component. Lampshaded by Aniseed when he first discovers he has magic.
Meaningful Name: Aniseed is a bitter spice that is used as a herbal remedy, much like Aniseed's taken role, to make people realise the unpleasant truth about racism and slavery and unite against it.
Berserk Button: Smugness. He absolutely hates it when others are smug. Nimble figures this out the hard way.
Also, being told that he was responsible for the deaths of some of the prisoners he freed, as they had joined him to stop the Rancid Windigoes.
After he wakes up from his second bout of evolution sickness and finds that he was cuddling with Asylum, teasing him about the event becomes one of these, to the point where he cuts Risk off with a very graphic threat just because Risk seemed like he was about to commence the teasing.
Conservation of Ninjutsu: He takes down the Bloodshed Brigade, which ranges from twenty to thirty ponies, with a bit of difficulty. Later, he defeats the Rancid Windigoes - which number in the hundreds - with pretty much no difficulty whatsoever. Then, he gets his ass handed to him by Cinder the Cyndaquil. Justified somewhat, as he was at different levels of anger during each respective event; plus, Cinder has fire attacks, which is Arrell's biggest weakness.
Dark and Troubled Past: Averted. As he states in chapter 34, his life on Earth was actually pretty decent, and he makes sure to list off all the things that make a cliché angsty backstory (orphaned or mean parents; no friends; no plans for the future; etc.) and states that none of them applied to him. The only reason he hasn't wanted to go back is because he simply prefers Equestria, and if Styx sent him back, he wouldn't care.
Ditzy Genius / Hidden Depths: In a bonus chapter, he can't sleep, so he starts solving math and physics problems. False takes one look, can't process any of it, and passes out.
Fighting Your Friend: When he heads off to save Asylum, he ends up being opposed by Risk, False, and Nimble, who are trying to keep him in bed so he can recover. This leads to Arrell actually fighting with Nimble and narrowly avoiding a battle with all three.
Has another after killing all the Rancid Windigoes, leading to angrily snapping at Risk and False.
Heroic Sacrifice: He gets melted by a trap when he goes off to stop Lord Frostfiend and the Rancid Windigoes.
Not Quite Dead: The cold air of the Rancid Windigoes' palace keeps him alive long enough to absorb the castle's ice and snow, healing him.
How Do I Shot Web?: He doesn't know how to do much as a Windigo, even flying. He also has extra powers that Styx gave him that he only learns over time.
Humiliation Conga: A non-villainous example; upon arriving in Equestria he gets attacked by a manticore, threatened by Rainbow Dash, and forced to sleep in an alley to hide. And just when things are looking up, he almost gets arrested by Princess Celestia and finds himself on the run, ending up in Manehatten.
I Did What I Had to Do: This is, at least, his opinion of the Dusk of Ice and Fire and the fight against the Rancid Windigoes. He hates having to have gone angry and killed so many, even though it was necessary.
Ill Guy: In chapter 22, a combination of a fever and his evolution into a Lord Windigo leaves him bedridden.
I Can Still Fight: When Asylum gets kidnapped in chapter 23, he fights through his fever and heads off to save her.
Leaning on the Fourth Wall: While almost all other chess pieces are aware that the world they live in is a television show, only Arrell actually knows that the world they live in is actually a series of fanfics, due to having read the stories prior to being sent to Equestria.
Breaking the Fourth Wall: He actively does this in a bonus chapter, from attempting to converse with the readers to being aware that False's dialogue is an ellipses.
Let's Get Dangerous: Whenever the situation gets serious, he drops all stupidity and goes full force to stop his opponents.
Mood-Swinger: Deconstructed. Sometimes he's cheerful and goofy (and a bit annoying), but he can easily switch to becoming depressed and cynical if you just say the wrong thing to him. Similarly, he can also quickly become angry.
Nerd: He used to be a video game nerd as a human, which becomes important when Styx grants him video game powers as his specialty. However, he can only earn them over time.
He makes several references that help cement his role as this.
Oh, Crap: Often during battles. A rare out-of-battle example is when something Risk says makes him think an article relating to Jeff the Killer is in Equestria. Turns out he was right.
Sai Guy: Temporarily wields two of them. Implied on the Wiki that he may still have them.
Sealed Evil in a Can: With him as the can; some form of darkness that even worries Celestia resides inside him. Said darkness turns out to be his own anger, amplified by Styx as a power-up when needed.
Stepford Smiler: He appears to mask his depression and/or anger with the optimistic, irritating personality that ponies know him for. See Mood-Swinger above.
Super Mode: Upon absorbing the Rancid Windigoes' palace and freeing the evil inside of himself.
Take Up My Sword: His (seemingly) last words are to tell Asylum to do as he would have done and stop the Rancid Windigoes.
What the Hell, Hero?: After about two dozen chapters of abuse and insults from her, Arrell finally snaps at False and more or less tells her to stop treating him so badly.
Younger Than They Act: In the short time he's been in Equestria he's fought off almost thirty ponies, launched an attack on a large Windigo clan, and saved almost a hundred lives total (and possibly all of Equis). Also, he's only sixteen years old.
Risk Reward, False Front, Nimble Night, and Asylum.
The Ace: Nimble; he has yet to truly "fail", unlike the other four members of the group. True, he lost to Cinder, but not only was Cinder being possessed by a god at the time, he wasn't the only one to lose - Arrell had to run away, and Risk and False couldn't do anything even when teaming up.
Forgot About His Powers: Inverted. When Risk, False, and Nimble are standing against Arrell, they list off the ways they have the advantage and he has the disadvantage. Cue Arrell pointing out he can fly and escaping.
Not So Stoic: He has to restrain his laughter when Arrell kisses False and sometimes has moments of snarkiness.
Tagalong Kid: Averted with Nimble; he's actually rather mature and calm, despite being ten years old.
Word of God states that Nimble is written to be the most mentally mature of the group, and to basically act as their Obi-Wan.
Took a Level in Badass: Asylum got kidnapped by the Rancid Windigoes and had to be saved...but once Arrell sacrifices himself, she becomes the new worst enemy of the clan.
Took a Level in Jerkass: False started off kind towards Arrell, but after getting back to Ponyville, she began to detest him. Whether this is because of her finding him annoying, not liking being forced to watch him, or both, is not yet fully clear.