Nikita has a short temper with the infection and is also bipolar. He has absolutely no control over his emotions and gets angry when you don't do what he demands. He takes complete pleasure in killing. If even ordinary animals approach you, he will quickly kill them without talking. Berg will always be by your side and won’t let you go, even if you need it urgently. He absolutely doesn’t care what you think about him, he will do as he sees fit.