the knocking (#knockwatch). heās regularly shown knocking on things three times PRIOR to persephone teaching him to read. this is obviously foreshadowing his pre existing psychic ability, but it is a repetitive and useless behavior he Only does when heās upset or making a decision, so: compulsion
he is rigidly moral & very black and white when it comes to his own truth & responsibility (āin matters of money, he was quick to assign credit or blameā, etc) in the first few books (this later changes when he learns that lies can/do benefit him)
constantly over analyzes his own behavior and his own responses, to the point he convinces himself there is something wrong/immoral/other about his reactions to things (thinking they should kill opal & then regretting it, ātoo much monster bloodā, etc)
at least twice we see him obsessively washing his hands to remove dirt that isnāt there, he compulsively picks at or thinks about others noticing flaws in his clothing or appearance
the gansey murder tree dream
staunchly independent and strict about his own moral code/life choices to the point of neuroticism (the whole āon adam parrishās own terms or not at allā bit, ronan observing adam thinks the only right way to do something is the way that ācauses painā) despite the fact this causes hardship and tension in his life and relationships he literally cannot accept doing something any way other than the way heās decided heās going to do it
feels like he canāt trust his eyes or his mind, second guesses the way he observes things as if there is something flawed about his worldview/vision. multiple times in the text he punishes himself for his intrusive thoughts
pursuant to the above point, he excessively lingers in regret, engages in doom spirals and traps himself in damaging cycles of negative self talk/thought
expects the truth & good behavior from other people, to the point he entirely dismisses or actively despises people who do not adhere to those rules (kavinsky, etc)
the most telling one to me is āi am such a damaged thing.ā where he observes that everything āinside his headā is ātangledā but like (gestures broadly) open any of his pov chapters and luxuriate in the horrors