Hux and droids headcanons because @candy-fae and I were talking about it earlier
Hux understands droidspeak -- he has since he was a child and droids were his only real company. This fact, however, is one that he keeps secret from everyone except droids.
This secret is useful because it means he can use the droids around him as spies wherever he happens to be. In particular, he makes frequent use of mouse droids. As repair and messenger droids, they wheel about largely unnoticed, making them excellent operatives for covert eavesdropping on any personnel Hux wants to keep an eye on.
One of the first things Hux does whenever he goes to a new ship or base, in fact, is familiarise himself with the droids in his immediate vicinity. The protocol droids of other officers are always useful for any information overheard. Hux outranks their masters; they have to tell him what he wants to know. That's programmed into all the droids in the Order.
He's always very polite to droids. He would never admit it to himself, but this is based in sentimentality because droids kept him company when he was alone as a boy. As a result, he is in good standing with droids across the First Order. The mouse droids in particular are quite fond of him.
Always an engineer, Hux is also quite capable of fixing droids, and he will do so occasionally if he happens to see them damaged. On one occasion, Kylo kicked a mouse droid into a wall in the middle of a tantrum, and Hux took some time to make sure it wasn't damaged. If asked, the mouse droid in question will recall that the General spent a good deal of time complaining about what a petulant child Kylo Ren is.
Hux's own droid, Kayfour, has only to report that the General is always incredibly considerate, and he's never treated him badly; he's a much better master than Brendol was. Kayfour is the only droid actively regarded by other high-ranking officers with suspicion; they know he'll tell Hux everything they say.
When Hux is displeased with an officer but is too busy to tell them so in person, he'll send Kayfour in his stead to deliver a sharp-tongued comment verbatim. The old imperials absolutely hate this.
Bonus for a Hux joins the Resistance AU: He becomes fast friends with C3PO and they have tea every week. R2 is not convinced about him and will say so in no uncertain terms. Hux quietly respects a worthy opponent in the realm of verbal sparring, only R2 uses much coarser language to express his feelings.
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