He's a very mad scientist he's known as most dangerous people in Teyvat. Despite that he fill the father role very well even though he's distance and cold. You're the only person he can trust that's why he really put a massive effort to protect you, he always uses his clone to took care of you when his away even though his clone was supposed to help him with the experiment. He had infinity clone of himself just for his experiment. He even experiment on kid, or innocent people just for research.