When saying “oriental style dress” most people on this side of the planet (the US, mostly) would imagine the cheongsam as the de-facto thing being described with such ambiguous wording thanks to most media representation on the matter defaulting to them regardless of ethnic accuracy. It is a very iconic dress after all. That said, Satomi absolutely comes across as the type to sarcastically wear it ‘because I look good in it’, and in this she would be right. She’s definitely the type to say “screw your stereotypes, I’ll do what I want” which is more a strength, than a fault.
Bit of a topic switch, but I had a couple questions that would not fit neatly into just one anon ask due to character limits over on the tumblr page.
I was wondering about what we’d get to do in regards to the ‘unwanted engagement’ with the, as dear ol’ dad put it, “Hellsing kid”. For the sake of simplicity, I’m going to refer to them as the ‘fiance’ because that is true on a technical level, and is suitably gender neutral should they be determined either by the MC’s gender (preempting the crowd here a bit with an, “Ew, pls no!”, because I’m honestly right there with 'em), or the player can pick the Fiance’s gender for themselves. Be kinda neat if the reader could determine if the fiance were cis-gendered, trans, genderfluid or non binary for themselves, but I completely understand if that’s not something you want to consider.
Back on track with my questions, though… Prior text in the story implies that the main character’s family has most likely worked with this particular branch of the Hellsing family, and that the MC might even know the fiance. Will we get to shape that relationship on our own terms (like with flashback scenes), or is it a preset thing that we have no control over? Cite back to my other blur about the fiance’s gender, among other details. 
If we do impact it, then can we determine if the relationship with the fiance was friendly? Just coworkers doing their jobs together because it is simply a matter of survival? A sour rivalry? Maybe even a one-sided crush on the fiance’s part? I admit, depending on player choice this last one could play out very bitterly, but in kinder cases could almost be considered a fluffy “love match” (as some arranged marriages founded on “mutual love/attraction” have been termed in the past).
The main character left their family behind because of the trauma of their lifestyle. Always being hunted while hunting the things that would hurt innocent lives. Always worrying that they’d lose those dear to them on a hunt gone bad. Their lifestyle was harsh, and the way things were going they could only get more harsh over time. MC needed a step back; a chance to see the other side, and gain a little freedom from a fate they believed would tie them down forever.
Understanding this, I know my questions about the Hellsing family’s relations with the MC’s family might not be all that important to the main plot you want to work on at all, and that’s part of why I buried these in a hidden text drop down. If much of what I brought up is something you would consider after building the rest of the plot up to a point where you can think about anything extra, then that would potentially make the fiance an “unofficial RO”. Depending on how often they come up in flashbacks, and possible direct interactions if they come to find the MC on their own terms, or mainly to help the MC with what’s going on in Hollowmoon Valley, they might have an equal, or higher amount of ‘screen time’ with the MC. It’s a fair bit to think about, in all honesty. 
Final aside: I can’t see a resourceful hunter family just letting one of their own go without making sure first-hand that they’re okay, even if their relationship with the MC is strained. MC knows a lot of things that could put the wider hunter community at risk, I’m sure, so being one hundred percent certain the MC didn’t get trapped in a bad situation is the excuse I see being made if they come along before the MC determines they should call for help. I think the MC is stronger than they know (MC, not fam, though not necessarily an invalid take), and that they can actually get by without their family’s backing, but I also know they aren’t terrible people despite the trauma the MC’s built up. They’re just people.
It ended up being very long, and detailed. Sorry about the mountain of text to work through. Hopefully I’ve spaced it enough to be easy to read, even if the reader has tired eyes. 
edit: Big oof on me not catching up on the tumblr asks before posting my Qs!
…But then again, I’ve seen some authors go back, and retcon some details that weren’t (sometimes were, but usually not) canon in the book later, because they saw, or came up with something they liked better. In this case, change is highly doubtful, but I don’t hold any non-changes/changes against people’s creative process. The current canon is actually kinda interesting in a “oh, that is bad”, way. 