Nah, it's not reproducible. It can certainly give you some common phrases, but to create an entire personality with its own set of speech patterns is a different thing. For example, Claude can suggest following friendly conversation starters to sound like a native (a quote below):
Popular combinations for texts:
"Прив! Чё как?" - "Hi! How's it going?"
"Дарова, живой?" - "Hey, you alive?"
"Салют! Как сам?" - "Hey! How are you?"
Modern slang (especially among younger people):
"Хай" (Khay) - borrowed from English "hi"
"Йоу" (You) - borrowed from English "yo"
When asked, which one it would pick, it goes with "Дарова, как сам?" (Darova, kak sam?) and that already sounds odd in many contexts.
Obviously not. But this is what LLM may give you, unless you know exactly what to ask for (which you will not know without the proper knowledge of language and cultural context).
