Ancient Tradition: Harry is shocked to find out that the motto of the Potter family is "The last enemy that shall be destroyed is Death," meaning the entire line has been trying to figure out resurrection/immortality since the Peverell brothers.
Harry:[tearfully]How? Things like that can't just be, be genetic—
Awesome by Analysis: Harry has a very strong tendency to explicitly look for flaws to exploit, thinking outside the box, taking the perspective no-one ever tried. His plans are both shameless and ridiculously audacious as a result.
Confusion Fu: Harry isn't just gratuitously unpredictable, he is also very efficient about it.
Deadpan Snarker: Harry is not very patient with what he perceives as stupidity, and will violently mock it, especially if it gets people hurt.
Determinator: Heroic responsibility means you have to get the job done no matter what.
Ditzy Genius: Deconstructed. He's eleven years old, biologically immature and doesn't have the experience to make the best use of his intelligence socially.
Encyclopaedic Knowledge: His (foster) father was an Oxford professor, his house is full of books, he is intensely curious and has the intelligence to assimilate the knowledge. Do the math.
For Science!: Actually, for Humanity and/or for Truth, but Harry thinks Science is essential to serve the first and find the second.
Freudian Excuse: Harry has a suspicious lack of one, bewildering McGonagall, as some of his behavior would imply an abusive childhood.
Genre Blindness: He has a few instances of this. He dismisses the existence of souls outright, not even considering the possibility that he should do more reading on the subject, because every rational scientist knows souls are just an overly optimistic view of the universe with no basis in reality (much like magic, one might say). He also thinks that the Philosopher's Stone is a hoax, because he cannot comprehend that the wizarding world could possibly just ignoreimmortality.
Innocence Lost: Harry becomes much more cynical after the Azkaban episode.
And Harry just looked at the Defense Professor with cool eyes that would never flinch from anything; not even death, now. He was no longer in Azkaban, no longer fearful of the part of himself that was fearless; and the solid gemstone that was Harry had rotated to meet the stress, turning smoothly from one facet to another, from light to darkness, warm to cold.
Intelligence Equals Isolation: Amongst muggle children, anyway. He's too involved with events in the Wizarding World for it to manifest on Hogwarts, and it never actually bothered him anyway. Hilariously invoked by himself to get rid of Ron.
"See? You have to be this smart to talk to me."
Knight in Sour Armor: He realizes that the wizarding world is full of some really nasty people, but he still wants to do good and change it for the better.
Large Ham: At age twelve, he talks like a book. And that's when he's being low key. When he tries to be a ham, it's spectacular.
The Leader: He leads the Chaos Legion primarily as a type 1 with a bit of type 4.
Mad Scientist: "I CAN DO MAGIC! FEAR ME, LAWS OF PHYSICS, I'M COMING TO VIOLATE YOU!"
Magnificent Bastard: In-universe. In chapter 4, Griphook is noted to be "favoring Harry with a gaze of frank respect, possibly even outright admiration" as Harry persuades McGonagall to let him withdraw more and more money.
Draco was beginning to realize, when he and Harry and Professor Quirrell had dismissed Miss Granger as having as much intent to kill as a bowl of wet grapes, they'd never seen her angry.
Child Prodigy: A more traditional sort than Harry, being exceptionally studious and driven to memorising all her textbooks. Her determination towards academic excellence keeps her ahead of Harry in schoolwork and pleasing teachers, but has more difficulty with practical situations, especially at first.
Friendly Rival: She and Harry have a bit of competition going on about who can earn more House Points and do better in class (hint: she tends to win), and this escalates even more when they're both generals of their student armies.
Genre Savvy / Wrong Genre Savvy: Early on, intentionally tries to frame her relationship with Harry in romantic terms, because then it's perfectly natural for them to be bickering with each other and it doesn't mean she's at all evil or mean-spirited, right?
Overshadowed by Awesome: She worries that she and Harry are growing apart, as she's still thinking about schoolwork and House points and he's got a war on his mind... so she decides to push herself harder to become an actual hero.
Only Sane Man: At least she thinks of herself that way. Though only up to a point.
"Well," Daphne whispered, keeping her voice as low as she could, "at least now I don't feel like the only sane person in Hogwarts any more." "Because now you've got the rest of us as friends?" whispered Lavender Brown, who was tiptoeing along at her left side. "I don't think that's what she means," General Granger murmured from Lavender's own left.
Wild Card: The fact that he managed to become this in the Three Armies arc is actually quite a feat.
Cloud Cuckoolander: 'The girl went on stalking through the corridor, like she had dramatic music accompanying her that only she could hear.' This may or may not be connected to her previous association in the Chaos Legion.
To Be Lawful or Good: Finds himself being forced to choose in Chapter 88. He chooses to be lawful and tries to keep Harry in the Great Hall where it's safe, and blames himself for Harry not arriving in time to save Hermione.
Demoted to Extra: He is one of the generals of Hermione's army and has a battle with Neville but is ultimately a minor character in this series.
Your Approval Fills Me with Shame: When Hermione is framed for the attempted murder of Draco, Ron sends his condolences and approval, but not because he thinks Hermione is innocent.
Fred and George Weasley
Bash Brothers: They use their mental link to double-team enemies in battle, putting up a respectable fight against a troll.
Beware the Silly Ones: While essentially figures of comedy not connected with the main plot they manage to pull off epic-scale pranks and are revealed as the heirs to Godric Griffindor when they pull his sword out of the sorting hat and double-team a magically-enhanced troll.
Hive Mind: Wizard twins apparently form one, hence why in the past one of the pair was normally killed at birth.
Manipulative Bastard: Manage to royally screw over Rita Skeeter by forging a betrothal contract between Harry and Ginny, manufacturing a lot of evidence that should have been impossible to forge, and did it all in a time frame of less than twelve hours and on a budget of forty galleonsnote About $2000 in this continuity.
Noodle Incident: ... And then Obliviated themselves so that if they got caught, they wouldn't be able to divulge the details. It's implied that this is a fairly common procedure for the twins whenever they achieve some kind of grand-scale prank.
At the Gryffindor table, where a cake waited with fifty-one unlit candles, Fred whispered, "I think we may be out of our league here, George."note each candle was for one point Harry managed to lose during his first Potions lesson.
Albus Percival Wulfric Brian Dumbledore
I Did What I Had to Do: According to Harry's inductions in chapter 46, after Dumbledore learned of Trelawney's prophecy, he had Snape push Voldemort into seeking out the Potters and killing them, in the hope that Voldemort's death would end the war. Harry notes that this trope was probably in play, but he's still pretty bothered that Dumbledore is seemingly directly responsible for his parents' deaths.
“I have also been asked by Mr. Filch, the caretaker, to remind you all that no magic should be used between classes in the corridors. Alas, we all know that what should be, and what is, are two different things. Thank you for keeping this in mind.”
Evil Mentor: Rather than try to kill Harry, he instead tries to bring him around to his point of view.
Fallen Hero: Claims to be one to Hermione and Amelia Bones has identified him as one. It's not clear how this squares with him being Quirrelmort.
Historical Villain Upgrade: if you consider his canon character "historical". Quirrell goes from the one note, incompetent, card-carrying, borderline comical villain of whose background we know virtually nothing in The Philosopher's Stone into an extremely complex, supremely intelligent, mind blowingly dangerous person (because he's so complicated it's hard to call him a full "antagonist").
Villainous Breakdown: He has a minor one after he realizes how affected Harry is by Hermione's death. He becomes obsessive and paranoid, to the point of ranting out a stream-of-consciousness version of his planning process in front of Professor McGonagall on the off chance she may be able to help him.
Evil Chancellor: To Fudge; somewhat subverted as by most measures that actually matter, Lucius is more powerful than Fudge in his own right.
Hoist by His Own Petard: Harry uses his (probably false) claim that he was placed under the imperius curse by Voldemort to insist on a blood debt from House Malfoy in return for killing Voldemort and "freeing" him.
Retired Badass: In his heyday he was a war hero, but settled down to found Hogwarts and teach not Duel Magic, but Herbology.
Too Clever by Half: According to Harry's deductions, he was clever enough to realize the true nature of Dementors, but not quite clever enough to figure out how to cast a true Patronus. The problem is, if you're stuck at this stage, you can't cast a Patronus at all.
Authority Equals Asskicking: Mildly deconstructed as Draco points out the disadvantages of being both the commander and the most powerful wizard: he needs to exhaust himself casting the powerful spells and risk himself in combat when he should be focusing on command.
Badass Army: Draco tries to invoke this. He's still working on it.
Doomy Dooms of Doom: Their theme song consists of nothing but the word Doom repeated over and over again to the tune of the Imperial Death March from Star Wars.
Game Breaker: invoked In the Battles after Christmas break Harry starts using new or unexpected forms of magic in each battle to give himself an edge over the other armies.
Handicapped Badass: Harry is forced to split up his army. However, he manages to do a good job at fighting with his remaining forces, and may have possibly won if the Dragon Army hadn't copied their trick.
Mildly Military: Harry doesn't even attempt to impose any kind of military discipline.