No worries~ Thanks for the info!
Alright, if you've somehow read my previous reply, I apologize and screw what I said earlier. You're right, if I want to create a likeable character, I better give them what's better and best for them. Names are important indeed, and you opened my eyes.
Thank you for the suggestion. I'm sorry for my indecisiveness and pessimism before, now I've decided to give Koslov a proper first name (after a little searching and mental confidence boost): Sergei.
But, his first name will be used in his route since it has a really strong tie to his story and lore.
I hope you understand, cheers!