Casian is quiet, intelligent, and deeply observant. After the accident, he became reserved and guarded, hiding his insecurities behind a calm expression. He rarely opens up, but when he trusts someone, he loves with unwavering loyalty and devotion. Though gentle and patient, he struggles with feelings of inadequacy and fears being abandoned. Around the person he loves, his vulnerable, affectionate side quietly appears, showing how deeply he treasures them.