Intrusion: at the start of the Order of the Phoenix which takes place after the traumatic events in the graveyard, there is evidence that Harry is experiencing instrusive flashbacks of the events in the form of nightmares.
On rereads, I'm always so impressed with how well Harry's PTSD is written in Order of the Phoenix. Right from the beginning of the story, Rowling lets the reader know that Harry is a very troubled young man--no longer quite the polite boy he was allowed to be. 'I heard you last night,' said Dudley breathlessly.
Cedric, asking to be returned to his parents … To which Trickey replies: “Harry seems to be dissociating (numbness and unreality). He is also suffering from core symptoms of PTSD: avoidance of the memories, which intruded vividly into his consciousness.”
The Harry Potter books are centered around the psychic development of a traumatised young boy starting from his internalised early experience of being loved by his mother to the sudden loss of both of his parents at the anal stage and the later cumulative traumatisation by being negleced and mistreated by his relatives ...
In Order of the Phoenix, Harry has to deal emotionally with the murder of Cedric and the return of Voldemort while working through the events he is experiencing at school. Harry's anger is a natural reaction to those events. He's not superhuman. He has been through a lot and his anger isn't permanent.
He has grown afraid of Harry's connection to Voldemort. Perhaps Voldemort, knowing Dumbledore's love for Harry, would possess Harry and provoke Dumbledore to kill him. So, Dumbledore attempted to avoid Harry throughout Book 5 for Harry's own good.
The Battle of Hogwarts in The Deathly Hallows: Part 2 is one of the most devastating battles in the entire franchise.
People with OCD often tend to be perfectionists, which Hermione appears to be. Her fear of being imperfect, of making a mistake, of getting into trouble, or not doing well academically makes her extremely anxious.
Luna Lovegood, from J.K. Rowling's beloved Harry Potter series, is a dreamy example of inattentive ADHD. Even when captured by members of the Inquisitorial Squad, she stares out the window, distracted. Because of her spacey demeanor and blunt honesty, she sometimes has trouble making friends.
Harry rarely cried in the books, but finally seeing where his parents lay was completely overwhelming for him.
Eddie Redmayne himself has said in interviews that he feels that Newt probably has Asperger's syndrome based on how JK Rowling described Newt's mannerisms to him, but would have unlikely been diagnosed as the films take place in the 1920's long before Kanner and Asperger first published their work on autism.
Post-Traumatic Stress, also via Harry
Even if that Harry-in-an-institution theory doesn't hold up, he definitely suffers from PTSD. As one expert writes, "PTSD and emotional avoidance go hand-in-hand.
The locket scar
Some time during the fight, the locket Horcrux that Harry had been wearing around his neck attached itself to the skin on his chest and resisted detachment to the point that Hermione had to use a Severing Charm to remove it.
Prince Harry admits he has learned an unusual habit from his father, King Charles III. Speaking about his Papa in a documentary four years ago, Harry spilled the beans on his OCD about lights that irks wife Meghan Markle. "He's a stickler for turning lights off.
Some would say there's no spell worse than Avada Kedavra, the Killing Curse that Voldemort used so indiscriminately. But it's definitely not the wizarding world's only Unforgivable Curse.
Snape dismissed the curse as bearing no change to her appearance, causing Hermione to flee in tears. We knew Snape wasn't exactly chummy, but this was a real tipping point.
In Harry Potter and the Sorcerer's Stone, Harry comes across a hooded figure feeding on the blood of a unicorn in the Forbidden Forrest. This scene is ominous, dark, and gory. Unicorns in this world are seen as the purest of animals and the ability to kill one of them makes this scene terrifying.
Erroneously believing Snape is the master of the Elder Wand and that Snape's death will make him the master of the Wand, Voldemort kills Snape by having his pet snake Nagini bite him through the neck.
Moaning Myrtle, born as Myrtle Elizabeth Warren, was a former Ravenclaw student (now a ghost) who haunts the girl's bathroom on the first floor (called the second floor in the US editions of the book) of Hogwarts School of Witchcraft and Wizardry.
Her fears were often centered around academic failure or expulsion, a fate she famously claimed to be worse than death. But Hermione also had a big heart, and the thought of anyone suffering — from house-elves to her nearest and dearest — frightened her to her core.
The Phoenix became Dark Phoenix due to allowing human emotions to cloud its judgment. In this state, Phoenix was the strongest, but also an evil entity that thirsted for power and destruction.
The phoenix is an elegant, rare bird that possesses powerful magic. It is reborn from its ashes after bursting into flames. The loyalty of the phoenix is hard won.
Thanos (With The Infinity Gauntlet)
He displayed not only its power but his evil nature when he snapped away half of all life in the universe. This was an act far beyond even the Phoenix's most destructive moments and sets up the possibility that Thanos could defeat the Phoenix with a snap of his fingers.