First of all thank you for your answer!If you ask about the characters, the first one is Erast, a Jock in Sveta's class. The second one is Grigory (Gregory?) a farmer that lives in the village of her grand parents and whom she can meet in the fields around the village and later in her barn.
If you are asking about the models that are used to portray those characters... no idea.
In addition, I would like to ask, I checked the information of these two people on WIKI,
Does Erast have no storyline and no way to interact with it now?
As for Grigory, I didn't see him when I walked back and forth between Gadukino and Field. I only saw cows and horses...