As a huge fan of Fall-from-Grace, Arueshalae feels like a missed opportunity. I don't want to ascribe intentions towards the developers, but I do feel that Arueshalae exhibits many typical "waifu tropes" - often times in disservice of her arc and character. Some minor spoilers below.
It's not just that she's characterized as soft-spoken (i.e. like Sosiel or Ember). It's as others have pointed out - it's the package of overt submissiveness, the "cutesy shyness", and the almost awkward, cartoony-melodramatic innocence. I.e. the self-imposed "horny jail", or the lines like: "I have to break with everything demonic in me but please, Desna, let me keep my beautiful irresistible wings?" I know the game justifies some of her innocent behavior with the "previously-unfeeling-android-learns-human-emotions plot-line", but this doesn't change the fact this is all in service of the writers' choice to characterize her as such.
On its own, this characterization isn't even a major issue. Characters can be cutesy and innocent and be well-written. The problem is, given her premise, that none of this is balanced by a proper focus and introspection on the horrid nature of her previous existence, which is what would've given her arc weight, and her character depth.
While the writers definitely do tell you how horrible she used to be, there's little effort made to make you feel it. Her words, action, and storyline feels much more like dealing with a teenager learning to work with her emotions (to love and to forgive) than dealing with a reforming mass murderer. You really do not sense the gravitas of the thousands of years of evil - the feelings of guilt and regret of an immortal who has seen and done some truly despicable things.
This is most noticeable in how the game frames the memory of her victims - the sources of her guilt. They're almost universally portraited as belligerent and intensively spiteful. In fact, I'd go so far to say that the game deliberately goes out of its way to downplay her victims' relatability, make them unsympathetic, and shift the victimhood over to Arueshalae. The ghost tormentors in her dream are unrelenting in their hatred and abuse (and yes, I know technically they are manifestations of her guilt). The specific victim you meet in the abyss is characterized more like an overly-attached, psychotic ex-boyfriend that the player has to deal with (another romance trope btw), than a genuine victim.
Those encounters seem to be designed to make the player feel protective of Arueshalae, rather than force them to confront the reality of who she used to be. And I think that's the biggest mistake in her writing.
For me, the former, that invoking of the "she's sweet and adorable and must be protected at all cost" instinct ultimately feels very manufactured. It feels like the game is trying too hard to make her likeable. Whereas I think forcing the player feel and understand the depth of harm and pain she has caused, and thus the impossibly large mountain of crime she has to repent from, would've been so much more interesting. It would've given the weight of her struggle real meaning. Her choice to repent, despite knowing that almost no amount of good she can do now will ever erase the evil she has committed, would've made her a truly remarkable character.
Instead, I think Owlcat really chose to play it a bit safe, and the game suffered for it.
