collected source from all over Johnny’s.news110 which erm... unfortunately hasn't been updated since 2006, so this is actually quite old^^;
EDIT: Added with recent compilation of nicknames right below, source: manimani
大野智 Ohno Satoshi
Other than Sakurai, other members call him “Ri-da- (leader)”, (Sakurai calls him “Ohno-kun” or “Satoshi-kun”). Nino, in his cell phone site diary, calls Ohno “Pan-ya-san (Mr. Bread House)”. Among fans, other than the petname “Oh-chan” which Tomohiro Hara gave, “Ri-da-” is also rather popular. Recently (okay not so recent, this article is rather old already), in Ninomiya Kazunari’s radio show Baystorm, he called Ohno “Sami-”. “When Sami- goes for a meal with ‘big-shots’ he will foot the bill” – says Ninomiya. Pretty often you will also hear “Ojisan (old uncle)” coming from Ninomiya Kazunari. However, Ninomiya also uses this nickname for Aiba Masaki, so it’s hard to differentiate. Although “Ohchan” was actually his nickname during kindergarten days, but now it has been replaced with “Ohno” since losing to “Ohmura-kun” (someone else by the name Ohmura is now having the nickname ‘Ohchan’). Recently, people started switching from “Ri-da-” to “Captain”. When Arashi had a gathering drink (a farewell for Nino who’s leaving for America), with an excuse saying that other groups also call their leaders “Ri-da-”, Arashi members decided that they can’t be the same. It’s just that, does Arashi have some kind of periodic boom or something? They always change the nicknames for each other and we don’t know when they’ll change it again. (Now, “Sami-” isn’t heard at all)
樱井翔 Sakurai Sho
Most people call him “Sho-kun”. But Arashi member Aiba Masaki calls him “Sho-chan”. There was also a time where Ninomiya Kazunari calls him “Sho-pin”. Again, Ninomiya mentioned in his Johnny’s Office’s cellphone site “Game Nikki” and referred to him as “Sho-pin”. In Ninomiya’s online diary, he called him “Tenki-yohou-san (weather forecaster)” (this nickname came as Sakurai subscribed for an email weather forecasting magazine and always prepares himself before going out). It seemed like his name in Kisarazu Cat’s Eye “Bambi” is also heard on the streets. There are also older fans who call him “Sakku”. Basically people call him “Sakushou” in school, his juniors call him “Sakusho-senpai” or “Sakusho-san”. In ‘G no Arashi!’, he was called “Bukiyou na Daijin (useless minister)”. In ‘Game Nikki’, talking about his solo con ‘The Show’, Nino called him “Sho Double-U (Sho+W)”
相葉雅纪 Aiba Masaki
Most people call him “Aiba-chan” (In his junior days, because he’s so innocently cute, other performers called him “Super-Idol Aiba-chan”, that was when people started calling him “Aiba-chan” as a petname). Akashiya Sanma calls him “Akiba-kun”. In “Mashyuu TV”, they call him “Bacchi (derived from Aiba)” and introduced him as “Johnny’s Jimusho’s ‘new’ Ocharake (goofy) Boy”. Kanjani8’s Yokoyama Yuu calls him “Kappe (country bumpkin)”.
二宫和也 Ninomiya Kazunari
Most fans and members call him “Nino”, some fans call him “Ninomi”, “Ninomin”, “Ninomi-”. In his ‘Game Nikki’ he sometimes calls his own fans “Ninomimania”. In private (from Aiba/Matsumoto’s radio show on How’s It Going DVD of Nino’s Suppin (real face) Arashi in Sakurai Camera), they call him “Kazu”. Even when they are all the main spotlight of their shows, Sakurai (sometimes Aiba too), will call him “Kazu-kun” Among Arashi fans, there are also people who call him “Kazu” or “Kazu-chan” instead of “Nino”. At home, he’s called “Kazu”, he says that no one really calls him “Kazunari”. Some older staff crews who knew him since his earlier dramas sometimes call him “Kazunari”. Among these people, though there are some who misread his name as “Kazuya (same kanji 和也)”, seems like he doesn’t bother to correct them anymore.
松本润 Matsumoto Jun
Most people call him “Matsujun”. His seniors, big-shot artistes also calls him “Matsujun”. Among members, Aiba Masaki, Ohno Satoshi and Sakurai Sho call him “Matsujun”. Ninomiya Kazunari calls him “Jun-kun” (sometimes “Jun” only). Again in Ninomiya’s ‘Game Nikki’, there was once he called Jun “Pro-Golf-san”, but now he sticks to “Jun-kun”. By the way, that nickname was created to encourage Jun who is tensed when he joined the Golf competition in Summer 05’, since he finds it hard to wake up in the morning. Aiba, in his jokes, calls him “Matsumoto-chan”, while Ohno and Sho regards him as “Matsumoto-san (more formal)”. He was called “Kame (turtle)” in the beginning, Mr. Johnny called him that at the end of a flying events because he posed like one. Then at that time, since he is the “Ijirare Kyara- (character who gets bullied)” and “Hetare Kyara- (character who gets tired easily)”, members called him that jokingly. When he was in high school (together with Hirayama Aya), they call him “Mattsun”. There was once, Sakurai thought it was fashionable, and called him “Tsumoyun” – (MatsumotoJun), however it didn’t become a trend. When he was filming ‘Hana Yori Dango’, because he was acting as Domyouji and his clothes were all ‘prince-like’, seems like he was called “Ouji (young prince)” by Inoue Mao who was working with him. In ‘G no Arashi!’, because he is good at minor sports, members call him “Maina- Banchyou (minor sports captain)”. In Razor Ramon HG, he’s called “Aniki (big brother)”. The members sometimes regard him as “S (sadistic)”, as in ‘G no Arashi!’ he is called “Do-S Banchyou (Extremely Sadistic Captain)”. Since he acted in a lot of roles being experienced in love, he got a “Ren-ai Banchyou (Love Captain)” title from Aiba Masaki. And there was once in Aiba Sugoroku, he won the president’s chair, gown, brandy and a cigar, so Sakurai Sho called him “King” on the set since he looked like the king of tramps (from G no Arashi!). And he still has a lot other nicknames.
- omae and anata simply means “you”, the former in an extremely casual way (some regard it as rude) and the latter in a formal way (but some women in Japan call their husbands “anata”)
- if you notice san, chan and kun behind their names, you can read more about the usage here.