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'''Iwatate Saho'''

Born on October 4, 1994 in Kanagawa Prefecture

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* AffectionateNickname: Sahhoo
* AscendedExtra: Made it to the 2014 elections as part of the Upcoming Girls.
* NiceGirl: Has a calm and relaxed personality, and once she helped a fan who left messages in her Google+ saying he was going to commit suicide.
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'''Izuta Rina'''

Born on 26 November 1995 in Saitama Prefecture.
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* AffectionateNickname: Izuriina
* AscendedExtra: Was chosen as the center of Team Surprise's "Reborn".
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'''Okada Ayaka'''

Born on November 6, 1998 in Tokyo

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* AffectionateNickname: Ayaka
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'''Okada Nana'''

Born on November 7, 1997 in Kanagawa Prefecture.

Appointed as Team 4's co-captain in the 2015 shuffle.

Sub-unit(s) shes been in are:
*** Tentoumu Chu!

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* AffectionateNickname: Naachan
* AscendedExtra: Jumped up to #51st in the 2014 elections and also managed to appear in the senbatsu of "Labrador Retriever."
* SeriousBusiness: Her personality. There was also a three episode documentary on [=AKBINGO=] on this.
* [[ThoseTwoGuys Those Three Girls]]: Considered one of the "Three Musketeers" with Kojima Mako and Nishino Miki.
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'''Kawamoto Saya'''

Born on August 31, 1998 in Hokkaido.

Team Bís second choice in the draft.
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* AffectionateNickname: Sayaya
* PluckyGirl: Failed the 14th gen auditions, but still came back as a draft member.
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'''Okawa Rio'''

Born on March 1, 2001 in Tokyo

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* AffectionateNickname: Rio, Riorin
* TheBusCameBack: A tentative kenkyuusei for the 15th generation, she was oficially made a kenkyuusei in October 2013.
* OtakuSurrogate: A fan of ''Anime/AKB0048'' and ''Franchise/LoveLive!''
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'''Omori Miyu'''

Born on 3 September 1998 in Kanagawa prefecture.
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* AffectionateNickname: Miyupon
* AscendedExtra: Ranked for the first time in the 2015 elections at #67, becoming an Upcoming Girls member.
* IdenticalStranger: Fans noticed that she resembles Kanon Kimoto from SKE's Team E.
* ImageSong: "Romance Kakurenbo" (a song composed for the trainees to be sung before Team B's 5th stage) holds a special meaning to her. She was chosen to sing it ''solo'' in the 1830m album, a huge privilege for a trainee considering only four songs out of the album were solos, and the other three were sang by very popular members such as Atsuko Maeda.
* NamedAfterSomeoneFamous: Her name comes from the Japanese pronunciation of ''Mew'', the famous ''Franchise/{{Pokemon}}''. Her parents thought of naming her Pikachu, but Miyu sounded more normal and the kanji spelling is better (her name is written using the 'beautiful' and 'kind' kanji)
* SpellMyNameWithAnS: Her name can be either romanized as Miyu or Miyuu.
* VerbalTic: Adds "-pon" at the end of many words.
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'''Kato Rena'''

Born on 10 July 1997 in Tokyo.

Sub-units she's been in are:
*** [=AnRiRe=]

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* AffectionateNickname: Renacchi, Katorena
* AscendedExtra: She's the less popular [=AnRiRe=] member, but finally managed to rank #32 in the 2014 Senbatsu Election as a member of Under Girls.
** She also appeared in senbatsu for Manatsu no Sounds Good!, Sayonara Crawl and Labrador Retriever
* ChildhoodFriends: With Kitazawa Saki
* ImageSong: "Kaisoku to Doutai Shiryoku", which she was centre of.
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'''Kitazawa Saki'''

Born on June 5, 1997 in Aichi Prefecture

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* AffectionateNickname: Sakkii
* ChildhoodFriends: with Kato Rena
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'''Kojima Mako'''

Born on May 30, 1997 in Tokyo

Sub-unit(s) shes been in are:
*** Tentoumu Chu!

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* AffectionateNickname: Kojimako
* AscendedExtra: Was the first member of the new Team 4 (other than Miichan) to get into Senbatsu.
* [[ThoseTwoGuys Those Three Girls]]: One of the "Three Musketeers" with Nishino Miki and Okada Nana.
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'''Komiyama Haruka'''

Born on September 12, 1998 in Chiba Prefecture

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* AffectionateNickname: Komiharu
* GirlishPigtails: Always seen with them.
* PerpetualSmiler
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'''Sato Kiara'''

Born on August 11, 2000 in Chiba Prefecture

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* AffectionateNickname: Kiichan
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'''Shibuya Nagisa'''

Born on August 25, 1996 in Osaka.

From NMB, holds a concurrent position in Team 4 from Team BII.

Sub-unit(s) shes been in are:
*** Tentoumu Chu!

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* AffectionateNickname: Nagisa
* AscendedExtra: She's the center in NMB's coupling song for "Kimi no Hohoemi wo Yume ni Miru", "Kimi to Deatte Boku wa Kawatta".
* NewTransferStudent: Concurrent from NMB, where she originally hails from.
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'''Takahashi Juri'''

Born on 3 October 1997 in Ibaraki Prefecture.

Appointed as Team 4's captain after Miichan's transfer to Team K during the 2015 shuffle.
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* AffectionateNickname: Juri
* AscendedExtra: Got to center the coupling number "Himitsu no Diary" on "Mae Shika Mukanee". Also ranked for the first time in 2014, going straight to 28th place, making her an Undergirls member.
* EmptyEyes: Other members called her "Messhi", and say she has dead-looking eyes.
* FeminineWomenCanCook: Good at baking and often gives her food as a gift.
* ShipTease: With Ricchan.
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'''Tomonaga Mio'''

Born on May 17, 1998 in Fukuoka Prefecture.

Holds a concurrent position from HKTís Team KIV.

Sub-unit(s) shes been in are:
*** Tentoumu Chu!

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* AffectionateNickname: Mio, Miotashu
* AscendedExtra: One of only a few fresh Kenkyuusei that has ranked in the Sousenkyo. She ranked 59th during the 5th one. She was also featured in AKB's "Sayonara Crawl" and was chosen as part of the double center with Meru in "Melon Juice".
** She managed to jump up from 59th all the way to 27th in the 2014 elections, ending up in Under Girls.
* NewTransferStudent: Concurrent with her original group, HKT.
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'''Natori Wakana'''

Born on 7 June 1995 in Tokyo.

Has announced her graduation.
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* AffectionateNickname: Wakanyan
* AscendedExtra: Made it into the Janken senbatsu of "Suzukake Nanchara".
* {{Ojou}}: Other members say she's from a rich family.
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'''Nishino Miki'''

Born on April 4, 1999 in Shizuoka Prefecture

Sub-unit(s) shes been in are:
*** Tentoumu Chu!

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* AffectionateNickname: Mikichan
* GirlishPigtails
* [[ThoseTwoGuys Those Three Girls]]: One of the "Three Musketeers" with Kojima Mako and Okada Nana.
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'''Mukaichi Mion'''

Born on January 29, 1998 in Saitama Prefecture

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* AffectionateNickname: Miion
* AscendedExtra: Picked by Oshima Yuko to be the new center for "Heavy Rotation" during performances.
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'''Murayama Yuiri'''

Born on June 15, 1997 in Kanagawa Prefecture

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* AffectionateNickname: Yuirii
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