Simon is first seen in the new orphanage Phil got in after his previous home burned down. Simon was seen playing outside with Carol and Phil and it seems like that he cares about his siblings a lot. After a while, he was shipped-out by his caretaker and killed by the demons afterward.
Simon appeared to be a cheerful boy. He wore the standard Grace Field uniform and always appeared to be smiling a lot. What also stood out were his thick eyebrows and rather long and curly blond hair.
Phil and Simon shared a great bond with each other. This was proved when Phil was absolutely heartbroken when he knew what was coming for Simon after he was shipped out.
Simon did not know the real intentions of his caretaker and therefore it is assumed that he loved her very much, up until his death.