Haruto

Haruto (遥人) is a young orphaned boy who first appears in A Sunset With Orihara after losing both of his parents.

Personality
Haruto is portrayed as cheerful and innocent. He does not know Izaya’s hand in his father’s death and admires him a lot for “helping” them, and for his power where Haruto is powerless. He wants to become like Izaya even if he has to sacrifice his own humanity (which Izaya obviously would not prefer). It is stated that Haruto is clinging to Izaya to keep himself together.

He is much more childish and cheerful than Himari and tends not to think things through.

Background
Himari’s father was close friends and business partners with Haruto’s father. When their business succeeded Haruto’s father took all of the credit and became the director of the company. Himari’s father perceived this as a betrayal and hired Izaya to find an opportunity for him to kill the director and take all his money. What Izaya omitted was that the director had taken the reins of the company so he could take the full blame for a huge problem in the company and protect Himari’s father, who he would then leave the company to. Himari’s father, only learned this after killing Haruto’s father. Afterwards Haruto’s mother fell out with Himari’s mother, and eventually stabbed Himari’s mother with a chopper and tried to kill herself and both the children. She was sent to a mental institute, Himari’s mother was sent to the hospital, and the children were left temporarily parentless.

A Sunset With Orihara Izaya
Izaya took the two children in, though it's unclear if they remain with Izaya or live separately. Izaya uses both Haruto and Himari as his lackeys, entrusting them to run errands for him and help with small tasks.

A Standing Ovation With Orihara Izaya
After being taken in by Izaya, he was told he no longer needed to attend school and that Izaya would teach him everything he needed to know. Although Haruto claims to be a little sad not seeing his friends, he proudly lists all the subjects Izaya teaches him and Himari including: Math, English, Science, Economics, and Japanese. Despite not being able to see his friends, Haruto feels he has many friends around him including Sozoro, Isozaka, Lisa, Fujiura, and Mamiya. Izaya also tells Haruto that he may have any toy he wants, though Haruto decides not to bother Izaya and that he should help him carry bags and call people to earn the toy like his mother used to tell him.

Izaya Orihara
Haruto appears to idolizes Izaya, which is shown when Haruto happily states that 'Izaya knows everything', or 'let's ask Izaya-san'. The change from simply being grateful to him, to idolizing him, is most apparent when Haruto goes from referring to Izaya as 'onii-chan', to 'Izaya-san'. Both Haruto and Himari frequently assist Izaya by running errands for him or even holding doors to prevent 'bad people' from escaping. In return, Izaya treats them with toys and other gifts. Izaya also acts as a teacher for the two, tutoring them on subjects they would learn in school, along with others Izaya wants them to be savvy on.