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There's a lot of fluff about how Harry shows no sign of trauma from his upbringing but maybe it's because I was neglected and often spoken of as extremely well-adjusted, but to me Harry seems to be a pretty natural response to a combination of neglect and a stable upbringing? He's not like. Traumatized. But a lot of people just develop maladaptive habits from these circumstances. Like:
Dissociative tendencies. I know this one is not intentional, but he shows constant lack of focus which interferes with his schooling and will often just space out and stare at things. This is used as a device to point the reader towards plot relevant items and turn them from irrelevant details, but it is something he does.
Harry does not actually distrust adults outright at first! He goes to teachers for help! But he tends to disrespect them, and struggles to think of adults as figures of authority the moment they slip up. Hagrid's bumbling chaos, Quirrell's nerves, Snape beefing with an 11-year-old, McGonagall not taking his Very Real Concerns seriously, Vernon's bluster, these are moments Harry discards their authority - that child thought McGonagall was going to burn him at the stake at first, but was barely shaken by her later. And it makes sense! You are a powerless child, you are looked down on, but the "consequences" you face are things you got used to and feel are normal, so you take strength from being unafraid of punishment.
A lot of fluff is made about abuse victims and independence because yeah, obviously, but I do think a lot of his savior/martyr complex is egged on by his servile role; he lived his entire life apart from the Dursleys, but they relied on him. To be crude, when someone shits the bed he puts it in the washer. And I do think he takes satisfaction in being the best man for the job, and I do think that can breed a whole host of mental problems that will lead you to a fated suicide duel with a Dark Lord
The books are mean-spirited in general, but he learned a lot of the fundamentals on engaging with the world from the Dursleys. He's pretty consistently petty and vindictive! And I genuinely believe Harry is, personally, as a character, fatphobic (in addition to the doylist text being fatphobic), because it was something Dudley gets criticized for and thus something that proves Dudley isn't infallible, and he would have definitely fixated on it and felt comfortable doing so, because that's just how the Dursleys talk about people.
For that matter, he is in general stifled by the inner lives of others - he's somehow the most socially stunted person in a trio with Hermoine in it. He is at all times deeply uncomfortable by the thought that other people have feelings and motivations, and reifies people with strong, clear roles in his life, and a lot of his development is realizing there are people behind those roles. I stand by the fact that Harry naming a child after Snape is a symptom of unaddressed mental illness.
This boy is so unbelievably susceptible to mania. I'll acknowledge a lot of his behaviour is teenage bull-headedness but the way the extremes of "I need to be doing something Now" and catastrophizing only gets worse...You know when he's 30 he's going to get prescribed mood stabilizers
And these are all things that can spiral into really toxic and self-destructive behaviour, which we know because that's what happens in the books. I think part of pushing his trauma in fanfiction is accepting that sometimes when someone is traumatized they develop an awful personality instead of PTSD.
(You may now reread this entire post and think about Tom Riddle.)