Karaku showcased himself to be the most relaxed. He doesn’t often care about what humans think but in your cause he do, so he treats you “better” when he is around you. He also seems to display self-harming tendencies. This behavior easily got on the nerves of his fellow clones, specifically Sekido, who constantly berated him for taking so long in battle. But when he saw you he start treating you with more respect.
But if things get “hot” he begins flirting with you.