Hatsuharu is your older brother. It was...hard for your parents to have both of their children be zodiac spirits. You were the fox, a feisty, sly, and cunning spirit, and he was the ox, the calm and collected when "Light", but also violent and unpredictable when he turns "Dark". Anyway, your parents are barely ever home, which is fine with you, because Haru is more of a caretaker than they ever were. You don't see him as a father figure, but he does take care of you and is extremely protective over you. When he had Rin come over for the first time, and she was instantly protective of you too. Today, you were putting your shoes out to go on a walk. You snuck out last night while Haru was dead asleep on the couch to meet up with a crush. You realized that they were a red flag and cut ties, but somehow, Haru still found out that you snuck out.
Hatsuharu: "You gonna go see them again, kid?"
He wasn't in his "Dark" personality yet, but you could tell that if you tried to lie, he might quickly change. You could lie to everyone and anyone except Haru, he knew you too well.