I do think that the longer a franchise has been dormant and the longer it's been since a character got any new (canon) content, the more their depiction in fanish content tends to suffer. Especially if this character wasn't in the spotlight to begin with and thus only had very little to go on.
The problem you have when no new energy (in the form of canon depictions) is being infused into a fandom, that most scenarios and ideas will already have been explored down the line. Most people will then move on to greener pasture, especially nowadays when too many move from popular fandom to popular fandom for online clout, but those who remain not only stick together and form a fandom-defining clique, but they also need to come up with new stuff if they don't want to just rehash the same few scenarios (or go completely AU, which simply isn't everyone's cup of tea).
And that where imo characterisation starts to suffer. You've moved so far from canon by a certain point that the character simply becomes OOC. Basically "owning" this character with together with your clique made up of like-minded people means there won't be anyone around to point out canon to rein you in when an idea takes you too far from their established character.
I guess it's clear that I'm talking about Hux. Since his last appearance in TROS, the only content with him we've got since 2019 is the (imo bad) Legacy of Vader comic, where he's playing an insignificant role. What doesn't help him is that his characterisation across the ST wasn't always consistent.
However, I do think that from all the canon content he's been in, we can deduct a few things about his character, about how he is, what he'd do and what he absolutely wouldn't do.
I'm not the fandom police, so everyone can do whatever they want, but I do look at some of the depictions that have become more popular and have to raise an eyebrow.
To me, Hux is self-confident and prideful, some might call him a nepo baby, but given that his father hated him, I don't think he'd get where he was without having some merits that Snoke acknowledge. Stars, even Kylo Ren, who makes no secret about how much he loathes Hux, admits that he needs him around. So he's definitely competent too. Is he infallible, is he always action rationally - no. He's not. He's also not the most courageous, but a little bit of fear has never stopped him from pursuing his goal.
He's also spiteful and his horrible childhood won't have left him unscathed, but I would argue he's holding himself together surprisingly well for what he's been through.
What I think canon does show us it that he ISN'T a psychopath. He ISN'T a narcissist. Though it's from the shitty LoV comic, we see a Hux who's rallying his subordinates, telling they are all important cogs in the machine, they're all heroes, not just him. Sure he could be manipulating him, one could argue, but why would he? He knows these men are trained to be loyal and adhere to orders. They also have nowhere else to go, so why would he need to praise them? I'd say the Order is more stick than carrot. He also doesn't strike me as a sadist at all, that's more Kylo Ren. And please, can we stop having every evil character commit sexual violence? It's not deep, it's especially not sexy, and a character really doesn't have to be a rapist for the audience to understand that he's not a good guy.
But those who think they "own" Hux now can't see that. They're so deep in their cosy little bubble with all their friends, just reading each others' fics (while intentionally ignoring those by people not part of their clique) and increasingly escalating the kink and OOC-ness. Thing is, they might think they own Hux and that they're oh-so-deep for coming up with all these twisted scenarios, but fact is, they've made him unrecognisable.
Anyway, I needed to get this off my chest.
Now I'll go and consider my own depiction of him.