Мне кажется, только используя титул и более формальную лексику.

Hello and Hi[emoji][emoji]

Thank you, Anya! Yes, I knew that "thou" is archaic, but I had no I idea it could be used in translations of more "modern" poems! Thanks for telling me this! "How many blissful revelations..." © )

I have seen some translators use "thou" to express "ты" and "you" to express "вы." The distinction was common in Shakespeare, but archaic in contemporary spoken English. However, it can still be helpful to use in literary translations; for example, Pushkin's "Ты и вы" has been translated as "Thou and You."

Many thanks for your detailed explanation, Diego! It's very helpful. For the middle name - it's a great idea, actually. Exactly what I was looking for! And yes, for using "young lady" or "mister" addressing kids - I think it's almost the same in Russian. It really depends on the intonation - it may sound as a warning OR as a joke, so I guess it's somewhat simular. For more "formal" constructions - yes, Elena mentioned them, but your example is also very useful - so, again, thanks a lot! :)