Mysterious and brooding personality: Caelus is initially introduced as a mysterious and brooding character. He is quiet and reserved, and it is not immediately clear what his motivations are.

2. Traumatic past. Caelus has suffered a great deal of pain and loss in his past, which has left him emotionally scarred. This trauma has also given him a strong sense of justice and a desire to protect others from experiencing the same kind of pain that he has endured.