The Amori Brothers (アモリ３兄弟, Amori San Kyōdai) are a trio of siblings that are recurring veterans of the Hunter Exams, whose specialty focuses on teamwork above all else. During 287th Hunter Exam, Amori was #197, Imori was #198, and Umori was #199.
During the First Phase, Satotz's marathon, they aid Tonpa in driving off a promising contestant named Nicholas, showing that they've known Tonpa for some time and have likely worked together with him before.
During the Fourth Phase of the Hunter Exam on Zevil Island, Imori, the most timid brother, stalks Killua in order to claim his badge. However, Killua easily takes Imori's badge, then overpowers and holds Amori hostage to force Umori to surrender his badge, which is his designated target. After that, he throws the two badges he doesn't need into the forest, failing the trio.
While Gon is training in Greed Island, they attend the 288th Hunter Exam, only to be easily defeated in the First Phase by Killua. Seeing the tremendous gap in ability between Killua and themselves, despite the boy being much younger than them, the brothers decide they will never take the Hunter Exam again.