I don't think he will actually become a snake... and considering how his body is if he keeps on making horcrux then he's going to kill himself!! like he's going to wither away... I don't have the slightest clue what the cause is of his appearance... he looks like aquaman or something

I think it may have to do with both that he is the heir of Slytherin and splitting his soul. I really don't think he will turn into a snake but his snake like apperance is pretty cool.

I agree, he is becoming the very embodiment of so-called "Slytherin evil". This would certainly be very strong symbolism on the part of J.K. Rowling.

Yes, you explained it much better, of course you used more than two sentences, unlike me.

I think he'll get worse in apperance, because he's pushing 70, but I doubt he'll turn into a snake. I don't think it's possible.

Well, I think that Sissa gave a very clever explanation

However, what if Voldemort IS actually transforming? It's true he is known as the most evil wizard in the world and it makes sense to want to separate good from evil. Though it's a possibility that Voldemort does have control over his appearance, and there is more to it than just symbolism. Some of it had to do with the fact of how he was reborn (the flesh of servant, blood of the enemy, and bone of father unwillingly taken). The three ingredients are actually quite ironic, because none of them specifically apply to a snake. We already know from his pet Nagini, that he likes snakes and he's a parseltongue. Since Voldemort likes snakes, and his main goal is to prove as fearsome and kill mudbloods, he willingly shaped his appearance to look more fearsome. Honestly, if he remained as good looking as his younger self, would you really perceive him as an evil and powerful wizard? It's all part of the greater plot to kill Harry and others. The fact that he's a parseltongue also made it likely that he would choose a snake-like appearance.

There you go, I think you got it. Aging is a human aspect and since he no longer wants to be human, he has morphed himself into this snake like non-human. No one would question his mud-blood heritage after seeing him like that. I do think some of comes from the makeing of horcrux, I mean that has to change someone, right.

Here's a very interesting point! If someone was good and pure through and through, maybe they would start changing into an angel or a bunny rabbit or something along those lines. Because of the Slytherin background and heritage plus his being evil, Voldemort started morphing into a snake. Maybe the horcruxes have this power. Very, very interesting point, I like it! Like, they can be whatever you want them to be, depending on who is using them.

But if someone was good through and through, they wouldn't be making horcruxes because that would mean tarnishing their soul with murder, no longer making them so pure.

True, I guess I'm just being controversial here and trying to expand the possibilities a bit. I really like the idea of the horcruxes becoming a reflection of the true nature of the person who is using them. That would certainly explain why Vordemort is morphing into a serpent. (True nature - serpent from Slytherin, plus the Dark Lord is evil and slippery like a snake).

I agree with all of that

I think its due to the horcuxes, and the fact that they are being destroyed and that the one that is most powerful may be kept inside nangini, his snake that he is slowley morfing into a snake.

Yes, in the end it was because the horcruxes were being destroyed that he was becoming so snake like, I think. Even though it is interesting, isn't it, that he didn't start to take on at least some of the characteristics of Harry, being that he was a horcrux after all. I guess it shows how evil the horcruxes truly were.