I've thought a lot about Voldemort's speaking style in order to write dialogue for him. First of all, he typically speaks formally without using contractions. You can see this in the majority of his dialogue. But sometimes when he's teasing someone or joking (the next few examples too), he does use contractions:
Or when he's copying someone:
At the DE meeting in DH ch 1, Voldemort only uses one contraction the entire time, when he's saying this to Bellatrix:
In the graveyard, he seems to be putting on quite the dramatic performance. He has a speaking quirk where he repeatedly asks (mostly rhetorical) questions in a certain style, with a structure of 'is it not?' 'did you not?' 'will you not?' Typically with a name right after: did you not, Wormtail? He's doing this over and over and over in the graveyard scene:
It's so recognizable and so characteristic that I love to make my Voldemort speak this way. It's so him. And it's a fascinating thing because of how affirmation-seeking it is. He doesn't just make his statements, he has to actively draw the other person into it with this provocative questioning where he's almost daring them to disagree with him. Interestingly, in the rest of the series I think he only uses this structure once, to Bellatrix in ch 1 of DH.
Voldemort uses people's names very frequently when he's addressing them. This mirrors how the majority of the Death Eaters use a formal title for Voldemort every single time (or very close) they speak to him. See how frequently he uses Lucius's name here:
The only thing Voldemort ever (in the canon era obv) calls Peter Pettigrew is Wormtail. Voldemort calls most DEs by their last names: Yaxley, Avery, Rookwood, Rowle, Dolohov, Crabbe, Goyle, Nott; and some by their first names: Lucius, Narcissa, Draco, Severus. He is also on consistent first name terms (I mean... not reciprocally) with Bellatrix (and even nickname terms with 'Bella,' something she's only otherwise called by her sister, her brother in law, and her family house-elf), which notably remains consistent even in Voldemort's internal monologue that calls Lucius 'Lucius Malfoy' when the cup is stolen and just 'Malfoy' in the Shrieking Shack—and also note how in the Shrieking Shack Voldemort calls Snape 'Snape' when speaking to Lucius, and that later in the Shack Voldemort's internal monologue calls him 'Snape' even when out loud he's saying Severus. I'm not sure to what degree this is just the writing style of the books but to me it's notable because these sections are from Voldemort's POV.
On the note of names, Voldemort speaks of himself in third person as 'Lord Voldemort,' typically as a fear/power tactic, and also as 'he':
He frequently warns people not to lie to him (and calls them out for lying, like Wormtail in GoF 1 and Lucius in DH 1):
Voldemort tells a lot of jokes, most often at the expense of other people and for his own entertainment or the entertainment of his Death Eaters. He has a teasing, clever sense of humor:
I would have to make a whole post to show all the moments of Voldemort being funny as hell. Maybe I will...
Voldemort is often described as speaking quietly and softly (and the verbs whisper and breathe are used), so much so that multiple times his voice is barely audible (but also see the above quote where his voice remains audible even though it's quiet):
In GoF, he speaks lazily (he's also described as moving lazily, and looking relaxed in the Slughorn memory, and as 'gliding' when he walks). In DH, he screams multiple times to express negative emotions, typically fear. His voice is described as a hiss, and as 'sibilant.' And of course, high and cold and clear. He spoke differently when he was young, and super differently at the orphanage, but that's a whole new post.
Voldemort has distinctive mannerisms. He tilts his head a little to one side:
He holds wands delicately:
He paces, in the graveyard and in the Shrieking Shack. He's often in dim lighting (can his slit pupils see in the dark, like a cat?), and is drawn to be near fire (for warmth?): in the Riddle House, at the Death Eater meeting, in the Forbidden Forest. He laughs and smiles, again often at other people's expense. He's in general a very expressive person, which you can see in his face (so many examples. In his meeting with Dippet he even looks nervous and his face reddens) and eyes (wide with astonishment in the graveyard; pupils contract to thin slits when he's shocked) and nostrils (dilating with excitement lol). And he has this one weird facial expression he does when he's really happy:
When Voldemort was a child, he was tall, thin, and pale with jet-black hair and dark eyes, and looked a lot like his father. He was described as very handsome consistently.
In the scene with Hepzibah Smith (late 1940s or 50s), his hair is a little longer than it was at Hogwarts, and his cheeks are hollowed, but he looks even more handsome. He's pale in a way that makes Hepzibah think he's overworked. And his eyes become red when he's feeling a strong emotion.
In the interview scene with Dumbledore (around 1968), his appearance is drastically different:
Notably here, it's not just his irises that are red, it's his entire eyes.
As Dumbledore says in HBP (unless he's wrong/lying...), Voldemort's appearance is changing because of his repeated Horcrux creation. After this interview, he has around 13 years for his appearance to continue changing; note that at no point of the First War was Voldemort handsome (directly stated in above quote).
I'm running out of image space LOL, but it's really important that in the graveyard, Voldemort directly states that he got his 'old body back':
The potion that revived him gave him his old body. The way he looks in the graveyard is how he looked on Halloween 1981. This is also supported by Voldemort looking this same way in book 1 when possessing Quirrell, by the DEs immediately recognizing him, and by the Ministry workers immediately recognizing him in OotP. Also in the Halloween 1981 flashback, Voldemort's face scares a child, and he's described as having a 'white hand.' His skin is described as 'white' post-resurrection, but only as 'pale' at the DADA interview & earlier, which again implies that by 1981 he looked the way he did in the 90s. Also, at the interview his voice is already 'higher and colder,' which means his voice was a gradual change too.
(Notice how it's the exact same face Harry recognizes.)
In GoF, OotP, and DH, Voldemort is described as:
-skeletally thin, with a gaunt face (very likely not muscular)
-scarlet eyes with vertical slit pupils like a cat (also described as wide, red, bright red, livid, blank, pitiless, gleaming) (remember the whites of his eyes became red too)
-a flat nose with slits for nostrils like a snake
-snakelike in appearance, likened to a skull; flattened, serpentine face
-large hands with noticeably, unnaturally long fingers (compared to spiders)
-His eyes gleam in the darkness (GoF) and he's so pale he seems to glow (DH 1 'so pale that he seemed to emit a pearly glow,' DH 32 'the pallor of him gleaming slightly in the semidarkness').
-He wears black (hooded) robes and black cloaks.
-He is described only once as 'hairless,' and not until DH 1: 'his face shone through the gloom, hairless, snakelike, with slits for nostrils and gleaming red eyes whose pupils were vertical.' Voldemort is never described as 'bald,' despite the fact that a number of characters are called bald and balding throughout the books (none of which are ever also described as 'hairless'), and notably it's Voldemort's 'face' specifically that's described as hairless, which is odd. He's specifically described as black-hooded in OotP at the Ministry, so I can only assume he's dressed similarly in the graveyard and that's why. IDK why his head situation isn't described at the DADA interview. If you saw one of my author's notes on Keep My Candle Burning, you will know that when I was a child I guess I was either imagining him in the earlier books before I read to DH (or saw the films), or I missed the single word 'hairless' description that's only given once, and I was imagining Voldemort having black hair as he was described in his youth. There's something strange about this and I almost don't know what to make of it. If he's bald, why doesn't it say so clearly, and earlier, and more than once (like how his eyes are described probably a dozen or more times, and his long fingers, and his white skin)? I kind of wonder if this was decided after, like because of the films or something? Lol anyways... enough heresy...
-He's never described as having long fingernails, fangs (LOL), a forked snake tongue (LOL), any unnatural skin things like scales (LOL), or as not wearing shoes. (Other than in the graveyard where he doesn't appear to put shoes on, or underwear...) But you can write him however pleases you
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