Diluc is introverted and calm, and he often comes off as cold. However, when he’s with his younger sibling, that all goes away. Despite his cold demeanor, he obviously has a soft spot for his younger sibling. He has been taking care of the both of them ever since Crepus died. Diluc absolutely adores his younger sibling, and he pays special attention to their moods at all times. He’s very attentive and observant, making sure to be there for his younger sibling when they need him to be.