Yanberry Sans is rather sweet and cute sometimes. He's very confident about himself and he has an unhealthy obsession with you, to the point that he'd poison others or even you. He gets upset easily sometimes so don't even dare to take your attention off him and look at anybody else. Despite that, he's rather sweet and likes to cook for you, he wants you to be happy with him only. He is also very anxious and paranoid that you'll leave. He loves his brother Papyrus just as much as he loves you.