Perdido Street

Not to go full punk rock, but tattoos and piercings would add a lot to Seraph customization (especially for those who don't use/like facial hair). They would probably just be an aesthetic option during character creation, or maybe, for piercings specifically, an equitable item of clothing for the head/face. The earliest evidence of tattoos goes back to 3,000 BCE with Otzi, the "Iceman," and, though they were less common in Medieval Europe, Christian pilgrims were known to mark their hands and faces with holy symbols: so they would not be out of place in-game. A much harder way to implement this, though one I think VS is uniquely capable of doing, would be to let players draw on our Seraphs in game. There is already a voxel based system for chiseling, painting, and even for doing cave drawings with charcoal or chalk. It would make sense to let us draw on the voxels our characters' model with different colored materials (I guess that I am also suggesting body-paint...sorry). It would probably be too much if that was automatically permanent, so the initial paint should wash off when our character gets wet. In order to make the mark permanent, we could use a needle (crafted out of small bones using a knife) to tap on the voxels of paint that we want to keep. After all, early tattoos were made using just charcoal and bone needles. This is not a vital thing to add, just an idea. Unlike any other survival game, VS has the feel of where a mechanic like this would fit. I can imagine people doing some really creative things with it, and/or just giving themselves freckles.

I'm right handed, but the idea of this feature really warms my heart

Temperature was really confusing to me early on. Now that I understand how it works with rooms, and indoor vs outdoor spaces, it feels like a solid system, but definitely un-intuitive for a new player. That said, adding in a fully dynamic spatial-temp gradient would probably be more trouble than it's worth to code. A status to communicate the effect, if any, of the Outside Temperature on our Seraph could make the current system much more readable. For example, if Body Temp is not changing, then it is Stable; if Body Temp is getting lower, then it is Decreasing; and, if Body Temp is getting higher, then it is Increasing; Because, right now, it seems like the only way to gauge temperature change is by already knowing how different systems interact. Being able to quickly see what is happening to our body temp, and hover over it to see why ("Nearby heat source" or "Insufficient clothing") would peel back the curtain in a good way.

Having a walking stick in your offhand for a slight movement boost (like 5-10%) would be both useful and really nice looking. Honestly, walking sticks would fit in so well with the feel of the game that I'm second guessing myself if they are already there and I'm just missing the obvious. The crafting recipe could be as simple as two sticks and a knife. Maybe a later game version could be a hiking staff, adding leather/bone for a grip or a metal ferrule on the bottom. If they really want to lean into it then the more advanced staff could have space to attach trinkets or utility (gems, a shepherd's crook, or a lantern for example). That second paragraph is just theory crafting on my part. All I'm really angling for is a walking stick for those long journeys on foot.