is a junior high school student living in Tokyo. He lost both his parents earlier — his mother, and years later, his father. While he believed his father was killed in an accident during a business trip Spoiler, he was actually a commander (and Mahoro's commanding officer) in VESPER and was killed-in-action during the alien war.
Although relatives offered to take him in, he refused and lived alone prior to Mahoro's arrival.
He is smart and has an IQ of 130. He makes a favorable impression on members of the opposite sex.
Suguru hired a maid because of the filthy state of his house. He was expecting an older woman, and Mahoro's arrival completely surprised him.