musebox, probably

[A]
Do you think I could get away with going out to an anime convention?

[Whether handwaved or not, you're someone allowed in Gershom's apartment for him to anxiously ask the question.]

I've seen pictures of modern cosplays and they're incredible... So maybe I could pass as someone wearing a really, really good mask, nu?

[B]
[Wow, that guy's Sans cosplay is really good. Like eerily realistic. His jaw even moves when he talks and he's got full articulation in his skeleton hands and everything.

Also, he's wearing a dozen charms of various anime cats.]

Excuse me, um, do you know if any of the vendors are selling cat ear headbands?

"...I admit I know very little of timid Gerasimos, whose hard work makes him near-invisible and his choice of abode further still; it is a rare day indeed when we cross paths. He is one of those few whose work not even the master himself can find fault with, and quite happy in his role besides.

...Some heavy sadness weighs constant on his shoulders, though it would take someone far more approachable and determined than I to divine its cause. There have been rumors of the circumstances that surrounded his employ, but troubled souls are ever present in the House, so it seems indecent to pry."`

This is a catch-all for Hades AU Gershom, AKA Gerasimos. He's a shade who works in the administrative chamber, and can be found either there or in the library of the house of Hades. He has his human appearance (the one with the beard) and while he can change to a skeletal form reflecting that time his boyfriend Sotiris turned him into a skeleton when he was alive and Thanatos had to go collect him after accounting figured out he'd been alive way too long and Sotiris tried to physically assault actual Death, he prefers not to do that. Because that's traumatic.

He's usually nervous and shy, not much of a self-esteem to speak of despite being one of Hades' best and least grudging administrators, but he lights up when talking about learning or books, and talking to him is how Zagreus unlocks access to the library to begin with.

Post is open to fellow Hades AUs or Hades canon characters.