"Nya" is a Japanese sound used by characters to sound cute or childish. It doesn't have a literal meaning.
In Russian, you could try these options to convey a similar feeling:
* "Кысь" (kys'): This is a playful sound used by cats in Russian, similar to "meow." It can be used to sound cute or childish.
* "Мяу" (myau): This is the standard word for "meow" in Russian. While not as childish as "nya," it can still be used to sound cute.
* "Ну, ты" (nu, ty): This is a more casual way of saying "Oh, you" or "Well, you." It can be used to sound cute or playful, but it's not as specific as "nya."
Ultimately, the best way to convey the "nya" sound in Russian would depend on the specific context and what you want to achieve.