Arthur Milligan  

, アーサー

Mrs. Milligan has a son named Arthur who uses a wheelchair due to being paralyzed. Initially, he was distant towards Remi, but they eventually became friends. At first, Arthur believed everyone only cared about his health and saw himself as a burden. When Remi tried to save him from falling into the river, he expressed that perhaps it would be better if he were dead than alive. However, Remi's words made him realize that if he died, his mother, who was also paralyzed and relied on him for care, would lose someone to look after her as well. After this realization, Arthur returned to being lively. It turned out that Remi is Arthur's long-lost older sister through their shared mother.