Am I using "ya" correctly?

[dbeirigo]

I'm not a native English speaker I'm Brazilian and here we have two ways of saying "you" one is "você" wich is generally used in all contexts and another is "tu" wich is informal, I have this character who's suposed to be rough so she only says "tu" I want translate that informal energy to the English version so I translate as "ya" but I'm not sure if it gives the impression I want to pass, it's not suposed to sound like an accent it's just suposed to be informal speech, she's not suposed to sound like a new Yorker.
Example how she talks:
"Call me that again and I'll break ya legs in half"

[llobucervallince]

Yeah is like that, and there's also the you all = y'all.

[CarltonIsaac]

From google -

Why do Americans say ya instead of you?
The pronunciation has changed over time, of course, but not by much. You may notice “everybody” saying “ya”: and it might be a regional or colloquial issue. Ya is simply an unstressed pronunciation of 'you' and/or 'your', which are already fairly short words

[NickRowler]

“Ya” is usually a shorten version of “you”, “your/you’re” or “are you”.

You
“Here ya go.”

You’re
“Ya not my momma!”

Are you
“How ya doin’?

[Ordinaryaverageguy]

she's not suposed to sound like a new Yorker.
Example how she talks:"Call me that again and I'll break ya legs in half"

That, to me, sounds just like a stereotyped New Yorker. Truth is, in my experience, 'ya' (like yah sounding) is not used all that often except in regional dielects. Most people I know, if they really shorten 'you' make it sound more like yuh instead of yoo.
This: "Call me that again and I'll break ya legs in half"
would more likely sound like: "Call me that again and I'll break yur legs in half"
And this: “Ya not my momma!”
more often sounds like: “Yur not my momma!”
Caveat: I have no strong regional accent personally & I presently live in what would be called the mid-west US where (I think) accents are not so strong as deep south US or north-east US.

[ralyash]

For what you are talking about, American English doesn't really have a formal and informal 'you'/'your' -- any variations of it are almost exclusively dialectal/regional. (Though, arguably, exposure to more diverse media has shifted this over the years.)

The short answer for those who don't want to read my nonsense:
You can use it that way, but it's likely to be read as an accent [in my experience] no matter what you do. Other variations of 'you' would include ya, yah, and yeh. (I would personally go with yah or yeh because 'ya' can also be a shortened version of 'yeah.')

Long answer:
New Yorkers, Southerners, and Bostonians usually have the strongest/most recognizable accents/dialects, and because of that, readers will likely 'hear' what they expect in the text. Then there are hundreds (if not thousands) of other different accents/dialects that can boil all the way down to a town or community, such as rural farm towns and more urban neighborhoods, or even different generations. There is no real neutral accent/dialect of most languages, but most have a Standard/Broadcast 'accent' that's widely used in media.

So I guess the better question to ask is, if she's not supposed to be a New Yorker, what is she supposed to be? If you can answer that, you can probably find a video with examples to help you out.

[dbeirigo]

Well in universe (it's space setting )they speak a neutral laguage that all humans speak which is shown to us as english but It's not english, she is suposed to sound like she's tough, rude and very informal, I know English from movies maybe there's a character who talks like that I could take inspiration, her English is suposed to be neutral but informal.