Arashi is composed of

Satoshi Ohno (大野智)

Sho Sakurai(櫻井翔)

Masaki Aiba (相葉雅紀)

Kazunari Ninomiya (二宮和也)

Jun Matsumoto (松本潤)

Satoshi Ohno, the oldest member of Arashi, is the reluctant "leader" of the group after winning against Sho Sakurai in a round of rock-paper-scissors with the other members on a Japanese variety show. The exact same pattern of him unwillingly 'winning' against Sho has been seen repeating many times ever since. He is the oldest person in the group and Ohno sings the lead vocals. Although he has stated that he wanted to avoid becoming the leader the most, Arashi members have once stated in an interview that Ohno is a new-age idol, who leads his group by not leading at all. Aside from leading the vocal work, he is known to be the best dancer and has the greatest control when it comes to singing in Arashi. Back when Arashi first debuted and before he was elected leader, Ohno was told by Johnny's to be the "Dance Leader". He choreographs several of their dance moves, which the other members sometimes find quite hard to follow. Other artistes from the same company openly expressed their admiration for Ohno's dancing; among them are Imai Tsubasa of the duo Tackey & Tsubasa, Kokubun Taichi of TOKIO, Yuuri Chinen of the newly-debuted group Hey! Say! JUMP, and other juniors. He is also one half of the Arashi skit duo Ohmiya SK, partnering Kazunari Ninomiya. Out of all the members, he has appeared in the fewest dramas, preferring to do stage plays or focus on his art. He performed his first solo concert on January 29, 2006. He became the first artist in Johnny's who held an art exhibit, which was entitled, "Freestyle".

Sho Sakurai sings most of the rap parts (known to fans as "Sakurap"), the lyrics of which he also writes. Sakurai was the first in the group to perform in a solo concert, The Show, on January 14, 2006. He is currently a Monday co-host of NTV's News Zero, on which he became the first idol to host an election special. Sakurai is arguably the best-educated member of the group, having graduated from Keio University, the Japanese equivalent of an Ivy League school. During the early years after Arashi's debut, Sho was appointed by the Johnny's to be the "Study Leader". Although he lost in a round of rock-paper-scissors, hence excusing him from being the group's leader, the other four of Arashi have made many remarks that Sakurai is the one who possesses leadership qualities.

Masaki Aiba is the tallest member of the group, with a distinctive breathy voice. He was once hospitalized after fainting due to the collapse of one of his lungs and was forced to stop playing the saxophone due to the operation he had to undergo. Aiba interacts with various wild animals as a co-host of the TV show, Tensai! Shimura Doubutsuen. He also excels in sports, especially basketball. He has been known to have considerably short attention span and often jumps between topics during talks and interviews, thus earning himself his reputation as the endearing, flaky member of Arashi. Sometimes Aiba makes some mistakes with Japanese, particularly in reading kanji. He can be seen making various reading mistakes in talk shows and live performances. During the earlier years following Arashi's debut, Aiba was appointed the "Image Leader" of Arashi.

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