What if when Billy gets put behind the x-ray and Batman's like "where are your bones" Billy panics, so bones appear, except, Billy doesnt actually? Know? How human bones work? So like, he just has a lot of bones under the x-ray now, except there are way too many and also that's not how ones are supposed to look like and fit in the human body??? Why is his whole torso from neck to butt covered in spines??? They're only supposed to be at the chest!
Marvel’s biology is strange. Batman knows that. After all, he and Martian Manhunter oversee the medical examinations of heroes. For some reason though, J’onn isn’t too concerned about it even though he definitely should be. That might be because of the fact J’onn’s a shapeshifter but still. Like…
Batman: “Say ah, Captain.”
Batman: *puts a popsicle stick on his tongue and looks around his mouth*
Marvel: “I’ evrythg gud? (Is everything good?)”
Batman: “Captain… Why do your teeth extend past your throat?”
Batman: “Why do your teeth continue past the normal amount until they disappear down your throat?” *gets a little flash light and peers it into Billy’s throat*
Marvel: “I’ tha no norma? (Is that not normal?)”
Batman: “No? Maybe?” *takes the popsicle stick away and turns off the flashlight*
Marvel: “How many teeth do normal people have?”
Marvel: “Oh, okay. Check again.” *opens his mouth and he now has 32 normal teeth before closing it back up* “Is that better?”
Batman: “It is for humans.”
Marvel: “Oh, well then that’s good because I’m an adult human male aren’t I?”
Batman: Why are you asking me?
The fact that Marvel had to ask if he was an adult human male was extremely offputting.
Supes: *using X-ray vision on Billy* “Cap, why do you only have lungs, a heart and a brain?”
Marvel: “What do you mean?”
Supes: “I mean, you only have lungs, a heart, and a brain. How are you standing?”
Supes: “Is that normal for your species or something?”
Marvel: What do you mean species? I’m human?”
Marvel: “Can you show me a photo of human bodily innards?”
Supes: *confused at the suddenness of the question* “Why?”
Supes: “Okay…” *shows him*
Random Bystander: *sees this and immediately thinks the two are gore fanatics*
Marvel: “Thanks! Now check again.”
Supes: “Woah… how do you do that?”
Marvel: “Well, I’m a human adult male. Aren’t I supposed to have those organs?”
Later, when Marvel told Flash about that incident…
Flash: “Geez, Cap. It’s like you were built by a kid!”
Marvel: “Ha ha ha… I know, right?”
Marvel: *awkward laughing*
Batman: *sees the awkward laughing*
Bruce somehow came up with the theory that Marvel was built by a child God and that’s why his biology was weird despite the fact he claimed to be a human adult male. But then again, if he was built by a child God, would they want him to tweak his creation every single time he wishes to be more human?