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I'm back on my bullshit, so buckle up buckaroos, it's gonna be a bumpy ride
ALSO, before I forget, I received an anon ask about if it was okay to write about my headcanons and such, and that is absolutely 100% okay!! I would love to see other people's interpretations of my thoughts, that's why I put them out there, so please feel free to interpret them as write about them, just give me credit, and let me know so I can see it!
Halt snorts when he laughs, but only if you really get him going. When he does, he'll turn bright red and try to cover his face, which works all well and good if the reason he's laughing so hard is because someone caught him super off-guard with a joke. However, nine times out of ten, he's only laughing that hard because someone decided to test his ticklishness (usually Crowley, but the others do it too once they find out), which means he can't cover his face without almost immediately moving his hands to grab the wrists of whoever's attacking him out of reflex
Speaking of Halt being ticklish, he would never admit it even under threat of death, but he actually doesn't mind being tickled. It shows him that people care enough about him to get close and try to make him laugh. He also finds it kind of nice to just be able to let loose and laugh when he usually can't out of fear of either vulnerability or tarnishing his reputation. Needless to say, if he lets you get away with tickling him, it's the ultimate sign of trust (kind of like a cat laying so its stomach is exposed and trusting you not to attack it)
When Halt is focusing on something, he has a habit of sticking his tongue out of the corner of his mouth (which I believe is something Horace actually noticed in KoC)
Halt has a bad habit of biting the sides of his fingers when he's nervous. If Pauline or Crowley happen to notice, they'll gently bat Halt's hands away from his mouth
If there is ever a mission that requires disguised infiltration in a high-class setting, Pauline and Crowley will almost always be the ones to handle it - and not just because of how well they coordinate off each other and work together. The main reason is because they both noticed how tense and jumpy being in that sort of environment made Halt after their first such mission. He never brought it up to them, and until KoC, they didn't understand the reason why (though they both had their theories)
Due to his royal upbringing, Halt is actually a very good singer and can play the piano as well (I don't know if the piano existed at this point in time. It's fiction. leT ME HAVE THIS)
Halt said that he can't face a plate of shellfish without throwing up, but he was underselling just how much even seeing a serving of shellfish deeply disturbs him. He'll usually start having a panic attack within the first few minutes, his mind telling him that the food is laced in poison, and that he is 16 years old and back in Clonmel.
Halt and Will both have severe PTSD, but only Halt is ashamed by it. At first, Will was ashamed of the way he was affected by his trauma, but Halt and his other friends shut that down really quick. Halt however, never had anyone who knew about what he went through, so he never had anyone to tell him that his struggling was okay. He was afraid that Will would end up the same way as he did, which is why he fought so vehemently against Will thinking he was doing a "bad job" of handling his trauma
Halt is very much a "do as I say, not as I do" kind of teacher. I mean look at him. This man's never even heard of self-preservation, but god forbid anyone he cares about pulls some self-sacrificing bullshit (that he pulls maybe 30 seconds later)