So! It's pretty verse dependent, but Dri's able to possess bodies. I'll explain that a leetle more.
His true body is, in fact, a snake. It's coiled somewhere in his world. It's lived a hundred years and will live a couple thousand more probably, if left alone. If ever ejected from another body, he comes straight back to this one, so whatever happens in the human world is fine.
His main body, (blond, 5'4,) was given to him by his god Susanoo so that he can better to do his job as one of their world's Sentries. I could explain more of it later, but in simplest terms, he acts as something of a shepherd to their snakes.
This job is easier done with hands and legs and stuff. It also helps to maneuver in the human world if he looks like them. So, he and his brother get presents.
The body acts pretty human - able to be harmed normally, for example - but it ages veeeeery slowly. Its metabolism is also weird, so he can get away with eating less. It's oddly energetic and agile for how little he takes care of it, really-- sustained by a god, it moves with something of an eternal youth, avoiding the settlement of bones and muscles that lead to aches and slowness. but at a glance, there's nothing revealing to be noticed about him.
His Seth body (brown hair, 5'7) was............ grown in a lab?? tube style??? in the og kagepreo verse this was done by kenjirou, obviously. but in main it's been switched to Hideo. This was done by request (and threats), and their relationship maintains that anything that happens to this or any of his bodies will be seen to by Hideo. This is his main point of getting away with shit.
This body runs differently- It does need to eat more, for one, being not sustained by a god. But when he's not using it, it essentially goes into a coma. He tries to visit it at least once a day to maintain some level of strength and flexibility. It's easy to end up with bedsores, unfortunately -- he ignores them. But it does leave this body with a degree of weakness that he doesn't love. I have health complications :(, he'll say, dying every night
But yeah functionally, the body borders on shutting down entirely. I think it grows, at what would be a normal human rate, if it were consistently alive - but it's more or less paused when he's not in it, slowing the rate of growth a bit.
He's capable of possessing humans. He finds it a hassle, since it leaves his preferred body empty and exposed, and, if they manage to maintain consciousness, he has to fight them for dominance. It's also just straight up tricky to do. There's potentially interesting and fun things about it, and he might be inclined to in the right situation - but it's so off his radar he normally forgets it's an option.
Unless- something drastic happens to the body he's using, and he needs another one in the vicinity. He'll do it without hesitation then.
He possessed Kathe when she was younger. She's a case study on what can happen in that situation.
The dead giveaway between any of the bodies is that his right eye is distinctly red. and glows softly when using his portal abilities. the other eye remains what's natural for the body, but the right will always change. He wears contacts when he goes out as 'Seth', which covers the color, but can't hide the glow if used.