Not much is known about the past of Silence, as he has spent most of his life training in the heavens to become a guardian angel. He is the son of the White Goddess and the half-brother of Strafe. Despite Strafe being his brother, he has never seen him as one, until he was appointed as his guardian angel, and seems to begin to care for him. Although forbidden to go to Earth, he does so anyway when he sees Strafe is losing his faith.
While Silence is born without any of the senses, he is a genuinely good being. Although he dislikes Strafe at first, along the way he begins to care for his brother. While he is considered a strong prince in the heavens he is often looked down upon by others, still seeing him as a child, which angers him. The removal of his senses were to prevent for him to sin, something he is rather conflicted about.
Because he has none of the senses, he has another set of senses, being able to communicate telepathically and stimulate certain smells, colors, shapes and all that through his mind. Thus whilst not being able to see, smell or smell anything he does know how what his surroundings are.