Multiple transplanted hands on each wrist?
He's got only one palm but with many fingers, think about it like a transplant surgery but someone added too many fingers to the palm. But, if he did have multiple hands, I can see it being quite weird, possibly a double forearm situation if that's the case but I'm not sure of the finger count on that one. The fingers are fine tuned sensors, better then the flat open palm, I'm thinking they move both facing the palm and the back of the palm, like having a double sided hand with extra fingers attached.
This image is just so disturbing. I have a feeling you plan on playing that up, right?
For the flexibility, I was actually thinking it's what got him found out, if seeing a man doing a 360° Exorsist style head spin then climbing up a wall and crushing himself into a vent isn't terrifying enough for normal people, see him doing that in utter darkness in an abandoned building. It gets quite unsettling, to me at least.
It certainly makes him feel more insectoid if that's the angle you're shooting for.
I could go with more insect but I was thinking like a lizard, I've seen them crawling up walls and glass no issue and that's what I was thinking since I'm not sure if the other things would fit with an insect…unless bugs are more horrifying then I thought.
First one, maybe, but I'd say no on phasing. Maybe his additional sensory apparatus allow him to sense things like Hume level fluctuations?
Yeah, someone else said phasing wasn't a good idea, I'll keep him solidly grounded in the solid state of matter then. Though, Hume levels are for reality, yes? It's stability and all? I can see him being able to somewhat sense the changes, not fully or where but something akin to a drop in pressure in the general area of a Hume difference.
This is actually a documented phenomenon called Synesthesia. I almost love the idea of him being an incredible artist because he can't see and it "allows him to sense the true beauty shrouded by light" or something.
I didn't realize it was an actual thing but yes, I wanted to include it. One thought I had for him was that when found originally his "home" was covered and thousands upon thousands of strange and unknown glyphs and seemingly words written in another language completely unknown to humans but written entirely all in red chalk and liquid and in Foundation custody he exhibits this effect repeatedly.
His story is a bite vague to me at the moment, but my thought was, there are other worlds then this and I went with that. He came from a rift, essentially, a timeline of Earth gone horrifically wrong, he was found already deformed, precise surgical markings indicating he's be altered but why isn't clear to others yet, though they all serve some sort of purpose for general survival. Flexibility and collapsing to escape or scare off predators, extremely heightened senses in order for him to see any dangers that may be lurking, though only physical and within his "sight" range, the fingers providing sheer grip to latch on if covered properly, the feet allowing vertical escape if he can't find any place to slither into or anyway to scare off whatever might be going after him.
But, one thing that might be included (not sure) is an anomalous necklace of sorts. It's like a layered necklace made of soft twine that has been rendered completely unbreakable and fused to the back of his neck, partially melted or even sewn to his skin. It would hold small chalk sticks, like the kind teaches had for their chalk boards in different colors. Each stick is seemingly endless, never running out but creating dusts that have strange properties but I'm not sure of them yet, I may not include this.
I'm not sure about his anatomy either, but I was considering an internal membrane, like a second skin that kept his bones from shifting too much. Either that or his bones are all somewhat malleable meaning he's able to bend more but he also wouldn't have stretchy limbs. Though, if he did have the membrane in thinking his bones have natural seams that can pop out of place to allow even more flexibility then an average human.